Sternal cleft is a rare birth difference in which the breastbone does not fully join in the middle before birth. Many people first hear about sternal cleft during pregnancy, at birth, or in early infancy because the chest wall looks different and the heartbeat may be easy to see through the skin. In mild cases, people with sternal cleft may have few problems, but in more severe cases there can be breathing trouble, repeated chest infections, or less protection for the heart and lungs. Sternal cleft is present for life unless it is repaired, and treatment usually involves surgery, often in infancy or childhood, to protect the organs and improve chest wall function. The outlook depends on how large the cleft is and whether other birth conditions are present, but early treatment can greatly improve safety and long-term health.
How many people live with Sternal cleft?
Reliable worldwide and U.S. counts of people living with sternal cleft, a very rare gap in the breastbone present from birth, are not available from a single trusted source. Published medical reports usually describe it as extremely rare, but they tend to report individual cases or how often it is seen at birth rather than a dependable current total for the world or for the United States.
Overview
Sternal cleftSymptoms
Sternal cleft is a birth difference where the breastbone does not fully join in the middle. The main sign is a visible gap or split in the chest, sometimes with skin movement over the heartbeat. Some babies also have breathing trouble.
Outlook and prognosis
Sternal cleft outlook depends on how wide the gap is and whether other heart problems are present. When repaired early, many children grow, breathe, and stay active normally. Wider unrepaired sternal clefts can leave the heart less protected.
Causes and risk factors
Sternal cleft usually results from incomplete joining of the breastbone early in pregnancy. It is often sporadic, but rare inherited syndromes can raise risk. Most cases are not linked to anything a parent did or did not do.
Genetic influences
Genetics may play a role in sternal cleft, but most cases are not linked to one clear inherited change. Sternal cleft can happen on its own or, less often, as part of a broader genetic syndrome.
Diagnosis
Sternal cleft is often diagnosed at birth or on prenatal ultrasound because the chest looks unusual. Doctors confirm the diagnosis of sternal cleft with a physical exam and imaging, usually a chest X-ray, ultrasound, or CT scan.
Treatment and drugs
Sternal cleft is usually treated with surgery to close the gap in the breastbone and protect the heart and lungs. Timing depends on age and the size of the opening, and some children also need care for related heart or chest wall problems.
Symptoms
Many babies with a sternal cleft have a soft gap or dip in the center of the chest that becomes more obvious when they breathe, cry, or cough. In medical terms, this is sternal cleft; in everyday life, it often looks like the breastbone did not fully close in the middle. Some children are otherwise well, while others may have breathing trouble or repeated chest infections, especially if the opening is wide. The early features of sternal cleft can range from a mild change in chest shape to problems that need prompt medical attention.
A visible groove, split, or soft opening in the middle of the chest is the most noticeable sign. It may look deeper when a baby cries or takes a deep breath.
The heartbeat or movement beneath the skin can sometimes be seen more easily because there is less bone covering the area. This can look alarming, even when the child seems comfortable.
Some babies breathe fast, work harder to breathe, or seem to pull in around the ribs and neck with each breath. These signs are more likely when sternal cleft is larger or occurs with other chest or heart differences.
Repeated coughs, wheezing, or chest infections can happen in some children. This is more likely when the chest wall does not support breathing as well as usual.
How people usually first notice Sternal cleft?
Sternal cleft is usually first noticed at birth, when doctors or family members see a gap in the middle of the chest where the breastbone did not fully form, sometimes covered only by skin. One of the first signs of sternal cleft can be visible movement or pulsing in the chest, especially when a baby cries, breathes deeply, or strains, because the heart and nearby structures are less protected than usual. In some babies, how sternal cleft is first noticed is during a prenatal ultrasound, while in others it becomes clear during the newborn exam or when the chest looks unusually split or indented.
Types of Sternal cleft
Sternal cleft can affect day-to-day life in different ways depending on how much of the breastbone does not close before birth and where the gap sits. In practice, the main types of sternal cleft are based on whether the opening is in the upper part, lower part, or along nearly the whole breastbone. Not everyone will experience every type, and the size of the opening often affects how noticeable symptoms are. Some babies have an obvious chest wall gap at birth, while others mainly show a soft area that moves more than usual with breathing or crying.
Superior partial
This is the most common type of sternal cleft and affects the upper part of the breastbone. Many babies have a visible V-shaped or U-shaped gap high in the chest, and the area may move inward or outward more than expected with breathing, crying, or coughing. Symptoms can range from mild cosmetic concerns to easier breathing discomfort or less chest protection.
Inferior partial
This type affects the lower part of the breastbone and is less common. The opening sits farther down the chest, and some children also have nearby differences involving the upper abdominal wall or structures around the heart. For many, symptoms depend on how wide the gap is and whether other birth differences are present.
Complete
In complete sternal cleft, the breastbone remains open along nearly its full length. This usually causes a more obvious chest wall opening, and the heart or major blood vessels may be seen or felt more easily beneath the skin because there is less normal bony protection. Complete sternal cleft is often more serious than partial forms and is more likely to occur with other congenital differences.
Can I slow down the onset of symptoms?
No. Sternal cleft is a gap in the breastbone that is present from birth, so there is no good evidence that diet, exercise, supplements, or other lifestyle changes can delay the start of symptoms; these habits may support general health, but they do not prevent or delay the condition itself. The main medical step is early follow-up with the right specialists, and when needed, surgery is the well-established treatment to protect the heart, lungs, and chest as a child grows; even though you cannot slow its onset, early care can still make a meaningful difference in safety and comfort.
What genetics can tell you about symptoms
Genetics can sometimes help explain why a sternal cleft happens, especially when it appears as part of a broader genetic condition rather than on its own. In those cases, the underlying genetic change may influence what other features are present, how severe the chest opening is, and whether problems such as breathing issues or other body differences show up early in life. But for many people with an isolated sternal cleft, genetics does not yet clearly predict day-to-day symptoms, severity, or exactly when concerns will begin.
Causes and risk factors
Most cases of sternal cleft begin very early in pregnancy, when the breastbone does not fuse fully in the womb. This usually happens by chance, and many families never learn a clear reason. In some babies, sternal cleft is linked to a genetic change or to other birth differences that affect the chest or midline of the body. Researchers are still learning how these pieces fit together. No well-proven lifestyle or environmental exposure has been shown to directly cause sternal cleft, so parents should not blame themselves.
What are the most common causes or risk factors?
Sternal cleft usually starts very early in pregnancy, when the two halves of the breastbone do not join together as they normally should, and in most babies the exact reason is not known. Sometimes it happens as part of a broader pattern of birth differences, including some rare genetic or syndrome-related conditions that affect how the chest and middle of the body develop before birth, but most cases are not clearly inherited. There are no well-proven lifestyle or pregnancy-related risk factors, so it usually does not seem to be caused by anything a parent did or did not do.
Environmental and biological risk factors
The known risk factors for sternal cleft during pregnancy are limited, and many cases happen without a clear reason. Doctors often group risks into internal (biological) and external (environmental). Because sternal cleft forms very early in fetal development, anything that disrupts this stage may matter most.
For many families, no clear biological or environmental cause of sternal cleft is found. This is common with very rare birth differences that begin in the first weeks of pregnancy.
Problems in very early midline chest development can increase the chance of sternal cleft. Because this stage happens in the first trimester, disruptions then may have a larger effect than something later in pregnancy.
Sternal cleft is sometimes seen alongside other early developmental differences affecting the chest or nearby midline structures. This pattern suggests a shared biological disturbance during early development, even when the exact trigger is still unknown.
Poorly controlled diabetes before or early in pregnancy can raise the risk of several structural birth differences. It is not a specific cause of sternal cleft, but doctors consider it a relevant biological risk when early fetal development is affected.
Genetic risk factors
For many families, the hardest part is that sternal cleft often seems to come out of nowhere. In most cases, no single inherited cause is found, and the genetic causes of sternal cleft are still not fully understood. Some risk factors are inherited through our genes. When sternal cleft appears alongside other birth differences, the chance of an underlying syndrome or chromosome change is higher.
Isolated cases: Most isolated sternal cleft cases happen in a child with no known family history and no clear single-gene cause. This usually points to a one-time developmental event rather than a strongly inherited pattern.
Family history: Rare family clusters have been reported, which suggests that inherited susceptibility may play a role in a small number of families. If a close relative has sternal cleft or a similar midline chest wall difference, genetic counseling may help explain future pregnancy risk.
Genetic syndromes: Sternal cleft can sometimes be one feature of a broader syndrome that also affects the heart, large blood vessels, abdominal wall, or face. When these other differences are present, doctors are more likely to look for an underlying genetic explanation.
Chromosome changes: In a small number of people, testing finds a missing or extra piece of chromosome material or another genomic change. This is more likely when sternal cleft appears with several birth differences instead of by itself.
Lifestyle risk factors
Sternal cleft is present from birth, so lifestyle habits do not cause it. Still, how lifestyle affects sternal cleft can matter because daily habits may change chest discomfort, breathing efficiency, activity tolerance, and the chance of injury to the unprotected chest. The most important factors are activity choices, smoking exposure, body weight, fitness, and habits that support lung health.
Contact sports, heavy blows to the chest, and other high-impact activities can raise the risk of pain or direct injury over the area where the breastbone is not fully closed. Safer exercise plans, protective gear when appropriate, and guidance from a clinician can help people stay active while lowering that risk.
Regular, moderate physical activity can improve stamina, breathing mechanics, and overall conditioning in people with sternal cleft. Sudden overexertion or poorly supervised training may worsen shortness of breath, chest discomfort, or fatigue, especially if other heart or lung problems are present.
Smoking and secondhand smoke can irritate the airways, increase coughing, and make breathing symptoms harder to manage. In people with sternal cleft, repeated coughing or reduced lung health may add strain to the chest and worsen day-to-day symptoms.
Carrying excess body weight can make physical activity and breathing more difficult, which may increase discomfort or limit function in someone with sternal cleft. Maintaining a healthy weight may reduce strain on the chest wall and support recovery if surgery is needed.
Risk prevention
Sternal cleft is a rare condition present at birth, so there is usually no reliable way to prevent the cleft itself. In most cases, prevention focuses on lowering the chance of complications such as chest injury, breathing problems, and infections, especially in infancy and early childhood. Standard prenatal care supports overall fetal health, but it cannot guarantee prevention of sternal cleft. Different people need different prevention strategies—there’s no single formula.
Regular prenatal visits, avoiding alcohol and tobacco, and reviewing medicines with a clinician can support a healthy pregnancy. These steps may lower the overall risk of some birth defects, but they do not specifically prevent sternal cleft.
Babies with sternal cleft should be assessed early by a team that may include pediatric surgery, cardiology, and genetics. Early planning helps lower the risk of missed associated problems and can reduce later complications.
When doctors recommend surgery, repairing sternal cleft in infancy often helps protect the heart and lungs better than waiting. It can also lower the chance of injury to structures that are less shielded by the chest wall.
Until the chest is repaired, gentle handling and avoiding pressure or blows to the chest are important. For many families, this can mean extra care during carrying, play, and positioning to help prevent injury from sternal cleft.
Can you prevent Sternal cleft?
No, there is no known way to fully prevent a sternal cleft, because it happens very early in pregnancy when the breastbone does not close as it usually should. In most cases, it is not caused by anything a parent did or did not do. Good prenatal care and avoiding harmful substances during pregnancy support overall fetal health, but they have not been proven to prevent this condition.
Transmission
Sternal cleft is not contagious, so it cannot spread from one person to another through touch, coughing, kissing, or any other kind of contact. It is a rare birth difference that happens very early in pregnancy, when the breastbone does not fully join in the middle.
For most families, sternal cleft appears as a one-time event rather than something clearly passed down, but in some cases it can be linked to an underlying genetic condition or, more rarely, run in families. If you are wondering about genetic transmission of Sternal cleft, a genetics specialist can help explain whether testing or family counseling may be useful.
When to test your genes
For isolated sternal cleft, genetic testing is not usually needed because it rarely changes care. Testing is more useful when the cleft appears with other birth differences, developmental concerns, or a family history of similar conditions, since that can point to an underlying syndrome and guide screening and follow-up.
Diagnosis
Sternal cleft is usually diagnosed in infancy because the breastbone does not fully join in the middle, which can create a visible gap in the chest. In some babies, the opening is obvious at birth, while in others it becomes clearer when breathing, crying, or during a routine newborn exam. Getting a diagnosis is often a turning point toward answers and support. The diagnosis of sternal cleft is based on the physical findings and then confirmed with imaging and, when needed, tests for related conditions.
Doctors look at the shape of the chest and feel for a gap where the breastbone should be joined. They also check how the chest moves with breathing and whether the heart seems unusually visible or less protected.
A chest X-ray or CT scan can show how much of the breastbone is open and whether the cleft is partial or complete. These imaging findings help confirm the diagnosis and support planning for treatment.
Because sternal cleft can occur with heart differences, an echocardiogram is often done to look at the heart's structure and function. This painless ultrasound helps doctors spot related problems that may need care at the same time.
Doctors usually begin by checking for other body changes that can appear alongside sternal cleft, especially in the chest wall, blood vessels, or midline structures. This may include additional scans or specialist exams if anything unusual is suspected.
How is Sternal cleft diagnosed?
Sternal cleft is often diagnosed before birth on a pregnancy ultrasound or soon after birth, when doctors notice that the breastbone has not fully joined in the middle of the chest. They usually confirm it with imaging, such as a chest X-ray, ultrasound, or sometimes a CT scan, and many babies also have a heart ultrasound to check for nearby problems that can happen along with it. If there are other birth differences or a family history, doctors may also suggest genetic testing to look for an underlying genetic condition.
Stages of Sternal cleft
Sternal cleft does not have defined progression stages. This is because it is a structural difference present from birth rather than a condition that usually moves through set phases over time. The diagnosis is often made in a newborn exam or after imaging such as an X-ray, ultrasound, or CT scan shows that the breastbone did not fully join in the middle. Doctors usually start with a conversation about breathing, feeding, and any visible chest wall movement, since early symptoms of sternal cleft can range from no symptoms at all to more noticeable breathing-related concerns.
Outlook and prognosis
The outlook for people with sternal cleft is generally good when it is recognized early and repaired surgically, especially in infancy when the chest wall is more flexible and closure is easier. Prognosis depends on the size of the cleft and whether there are associated heart defects, airway problems, or syndromic conditions, which can increase medical complexity and affect long-term outcomes. After successful repair, many children have good cardiopulmonary protection, normal growth, and acceptable cosmetic results, although some may need additional procedures or long-term follow-up. Delayed diagnosis or unrepaired wide defects can leave the heart and great vessels less protected and may raise the risk of respiratory complications or trauma. Mortality is not usually driven by the sternal cleft alone in isolated cases, but it can be higher when severe associated congenital anomalies are present. Overall, isolated sternal cleft treated by an experienced multidisciplinary team often carries a favorable prognosis.
Long-term effects
For many people, the long-term effects of sternal cleft depend a lot on whether it is isolated or happens along with heart, blood vessel, or other birth differences. Long-term effects vary widely, from few day-to-day problems to ongoing breathing, chest wall, or appearance-related concerns. In childhood, parents may notice the chest moving in an unusual way with breathing, while older children and adults may be more aware of exercise limits, discomfort, or worry about injury. The long-term picture is often better when sternal cleft is repaired early, but some people still have lasting chest wall differences over time.
Some people with sternal cleft have chest movement that is less efficient, which can make breathing look or feel unusual. In more significant cases, this may lead to shortness of breath with activity or reduced exercise tolerance later on.
Because the breastbone does not fully protect the chest in the usual way, the heart and nearby blood vessels may be less shielded from direct blows. For many living with sternal cleft, this can mean greater concern about chest trauma during daily life or sports.
Ongoing tightness, soreness, or a sense of instability in the front of the chest can happen, especially with movement or exertion. Some may find this is mild and occasional, while others notice it more as they grow and become more active.
A visible gap or unusual contour of the chest can remain an important long-term feature of sternal cleft, especially if repair is not complete or leaves asymmetry. Over time, daily routines may include choosing clothes more carefully or feeling self-conscious in settings like swimming or gym class.
How is it to live with Sternal cleft?
Living with a sternal cleft can look very different from one person to another: some people have it repaired in infancy and grow up with few day-to-day limits, while others may live with a visible gap in the breastbone that makes the chest less protected and can bring worry about bumps, contact sports, body image, or breathing discomfort. For many living with sternal cleft, daily life may include specialist visits, surgery and recovery, and being a bit more careful with physical activities, especially if other heart or chest differences are also present. The effects often reach beyond the individual, because parents, partners, and other loved ones may share the stress of medical decisions, appointments, and practical support, while also helping the person feel safe, included, and confident.
Treatment and drugs
Sternal cleft is usually treated with surgery, because the main goal is to protect the heart and lungs and help the chest wall work and grow more normally. When it is found in a newborn, repair is often done early in life, since the chest is softer then and the two sides can often be brought together more easily. In older children or adults, treatment can be more complex and may involve rebuilding the chest with the person’s own tissue or with a surgical support material if the gap is too wide to close directly. Treatment plans often combine several approaches, and medicines are usually used to support care rather than fix the cleft itself, such as pain relief after surgery or treatment for breathing problems if they happen. Not every treatment works the same way for every person, so the surgical team will base the plan on the size of the cleft, age, symptoms, and whether there are other birth differences present.
Can you cure Sternal cleft?
Sternal cleft does not usually go away on its own, but it can often be repaired with surgery. The main treatment is an operation to close the gap in the breastbone and protect the heart and lungs, and this is often done in infancy because repair is usually easier then. When surgery works well, many people do very well long term, though some may still need follow-up care.
Non-drug treatment
Living with sternal cleft can mean the center of the chest is less protected, so everyday concerns often include breathing, feeding, activity, and keeping the chest safe from injury. Sternal cleft is usually managed with surgery when repair is possible, along with supportive care before and after the operation. Supportive therapies can help with comfort, breathing, movement, and family coping. In babies and children, treatment plans also depend on whether there are other birth differences or heart and lung problems alongside the cleft.
Surgery is the main non-drug treatment for sternal cleft because it closes or partly closes the gap in the breastbone and protects the heart and lungs. When possible, repair is often done in early infancy, when the chest wall is softer and easier to bring together. In some older children or adults, more complex reconstruction may be needed.
Some babies with sternal cleft need careful positioning, oxygen, or temporary breathing support if the chest wall moves abnormally or breathing is hard work. This can be especially important when there are early symptoms of sternal cleft such as visible chest movement, fast breathing, or trouble feeding. Respiratory support is usually tailored to how mild or severe the opening is.
Physical and breathing therapy may help after surgery by supporting gentle movement, posture, and fuller breathing as recovery progresses. For many, treatment begins not at the pharmacy, but with guided exercises and safe ways to handle, lift, and position the body. If surgery is not done right away, therapists may also help families adapt daily activities.
When the chest is not fully closed, protecting the area from pressure or accidental knocks is an important part of care. Families may be taught safer holding, tummy-time adjustments, and age-appropriate activity choices while a child grows. This helps lower the risk of pain or injury to structures under the cleft.
Your genes may have an impact on how drugs work for you
For people with sternal cleft, medicines are usually not the main treatment because care most often centers on monitoring or surgery to repair the chest wall. The drugs that may come up, such as pain medicine, anesthesia during surgery, or antibiotics if needed, are chosen mainly based on age, overall health, and the details of the procedure rather than on the gene changes linked to the chest condition itself. In other words, there is no well-established gene-based medication plan that is routinely used for sternal cleft, although doctors still watch closely for how each person responds to medicines before and after surgery.
Pharmacological treatments
For sternal cleft, medicines do not close the gap in the breastbone, so drug treatment is usually supportive rather than curative. Most people with sternal cleft need careful monitoring and, when appropriate, surgery, with medicines mainly used around that care. Some medicines help with pain, prevent infection, or support breathing and comfort before and after an operation. Not everyone with sternal cleft needs the same treatment plan, especially if there are other heart or chest problems alongside it.
Acetaminophen and nonsteroidal anti-inflammatory drugs such as ibuprofen are often used to ease mild to moderate pain after surgery for sternal cleft. If pain is stronger, doctors may use short-term opioid medicines such as morphine or oxycodone with close monitoring.
Antibiotics such as cefazolin are commonly given around surgery to lower the risk of wound infection. If an infection is suspected, the drug choice may be changed based on the likely bacteria and culture results.
General anesthetic drugs such as sevoflurane, propofol, fentanyl, and muscle relaxants are used during sternal cleft repair so the chest can be treated safely. These medicines are chosen and adjusted by the anesthesia team based on age, breathing, and any other medical issues.
In newborns or infants with a large sternal cleft, medicines such as midazolam or fentanyl may sometimes be used in intensive care to reduce distress and help with breathing support. Dosing may be increased or lowered gradually to keep the child comfortable while avoiding too much sedation.
Genetic influences
Sternal cleft usually develops very early in pregnancy, when the two sides of the breastbone do not fully join. In many people with sternal cleft, there is no single known inherited cause, and it appears to happen on its own rather than being passed down through a family. Family history is one of the strongest clues to a genetic influence, but most isolated cases do not show a clear family pattern. Sometimes sternal cleft happens as part of a broader syndrome or alongside other birth differences, which is one reason doctors may look closely at the causes of sternal cleft beyond the chest itself. When that pattern is present, genetic counseling or testing may help clarify whether genes played a role and what that could mean for future pregnancies.
Is Sternal cleft genetic?
Genetics may play a role in sternal cleft, but most cases are not linked to one clear inherited change. Sternal cleft can happen on its own or, less often, as part of a broader genetic syndrome.
Having a genetic risk is not necessarily a diagnosis
Variants in genes are common in the general population and are a normal part of human biology. Most do not directly affect health and simply contribute to natural differences among people. For many genes, having a variant associated with a condition points to a possible link rather than a certain diagnosis, especially when several genes and environmental factors are involved. In some situations, however, a single well-understood variant in a particular gene can be enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
For babies born with sternal cleft, treatment is usually shaped more by the size of the chest opening and any related heart or chest problems than by a single gene result. In most cases, medicines are used mainly around surgery, such as for anesthesia, pain control, and infection prevention, and there are no routine genetic tests that predict which of these drugs will work best specifically for sternal cleft. Genetics is only one factor, and age at repair, breathing needs, and associated structural problems often matter more when doctors plan care. Still, if sternal cleft appears as part of a broader genetic or developmental syndrome, genetic testing may help the care team look for related problems in the heart, blood vessels, or abdominal wall, which can affect surgical timing and follow-up. For many families asking about the genetic causes of sternal cleft, the main value of genetics is in understanding why it happened, whether other organs should be checked, and what this could mean for future pregnancies.
Interactions with other conditions
Many living with sternal cleft also have other birth differences, so doctors usually look beyond the chest wall itself. This connection brings us to how the condition interacts with others. Sternal cleft can occur alongside heart problems present from birth, especially defects that affect the position or structure of the heart, and it may be part of a broader pattern of midline abnormalities such as problems involving the abdominal wall or diaphragm. In some babies, sternal cleft appears as part of a rare syndrome, so the finding can lead to checks of the heart, blood vessels, skin, and other nearby structures rather than treating it as an isolated issue. Day to day, these associated conditions matter because breathing, feeding, exercise tolerance, and the timing of surgery may all depend on what else is present. For families asking about early symptoms of sternal cleft, the main issue is often not the chest opening alone but whether another condition is affecting the heart, lungs, or overall stability.
How genes can cause diseases
Humans have more than 20,000 genes, each carrying out one or a few specific functions in the body. One gene instructs the body to digest lactose from milk, another tells the body how to build strong bones and another prevents the body's cells from beginning to multiply uncontrollably and developing into cancer. As all of these genes combined are the building instructions for our body, a defect in one of these genes can have severe health consequences.
Through decades of genetic research, we know the genetic code of any healthy/functional human gene. We have also identified that in certain positions on a gene, some individuals may have a different genetic letter from the one you have. We call these hotspots "Genetic Variations" or "Variants" in short. In many cases, studies have been able to show that having the genetic letter "G" in the position makes you healthy, but having the letter "A" in the same position disrupts the gene function and causes a disease. Genopedia allows you to view these variants in genes and summarizes all that we know from scientific research, which genetic letters (Genotype) have good or bad consequences on your health or on your traits.
What other conditions can cause similar symptoms to Sternal cleft?
Other birth differences of the chest wall, especially a sunken chest or a chest that sticks out, can sometimes be mistaken for a sternal cleft. In babies, a bulge from a hernia near the breastbone or problems with the heart or lungs that cause fast breathing, noisy breathing, or a bluish color can also seem similar, so doctors usually use an exam and imaging tests to tell them apart.
History
For most families, the history of sternal cleft becomes real in the delivery room, when a baby’s chest looks different or doctors notice a gap in the breastbone. Although it is rare, this condition has been described in medical writings for many years, first through careful observation of the chest wall and breathing patterns rather than through modern imaging or genetic testing.
Earlier reports usually came from newborn examinations or from surgeons documenting unusual chest wall differences. Over time, doctors recognized that sternal cleft can range from a small split in the upper part of the breastbone to a wider opening involving most of the sternum, and that some babies have it on its own while others have related differences elsewhere in the body. Not every early description was complete, yet together they helped doctors understand which findings were most important and which babies needed closer monitoring.
As medical science evolved, the history of sternal cleft also became a story of better treatment. In the past, repair was more difficult because surgery, anesthesia, and newborn intensive care were much less advanced. Later, surgeons learned that repairing the chest earlier in life often works better because the chest wall is still soft and flexible, making it easier to bring the breastbone together without putting too much pressure on the heart and lungs.
In recent decades, awareness has grown, and sternal cleft is more often recognized promptly after birth or sometimes even before birth on prenatal scans. Researchers later identified that some cases are linked to broader developmental or genetic conditions, but many questions have centered less on naming a cause and more on protecting breathing, the heart, and the chest wall as a baby grows. Knowing this history helps explain why today’s care focuses on early recognition, careful evaluation for associated findings, and referral to teams experienced in chest wall repair.