Primary autosomal dominant microcephaly 18 is a very rare genetic condition in which the head is smaller than expected because brain growth is affected. It is usually present from birth or recognized in infancy or childhood, and the features are lifelong. Many people living with primary autosomal dominant microcephaly 18 have a small head size, and some also have developmental or learning differences, so early signs of primary autosomal dominant microcephaly 18 can vary from child to child. Not everyone will have the same experience. Care focuses on developmental support, therapies, and regular follow-up, and because this condition is rare, its effect on life expectancy is not well defined.
How many people live with Primary autosomal dominant microcephaly 18?
There is no reliable published estimate for how many people worldwide or in the United States are living with primary autosomal dominant microcephaly 18. Only a small number of affected families have been described in medical reports, so the true number is unknown, but it appears to be extremely rare.
Overview
Primary autosomal dominant microcephaly 18Symptoms
Primary autosomal dominant microcephaly 18 mainly causes a smaller-than-expected head size, often noticed before birth or in infancy. Some children also have developmental delays, learning difficulties, or speech delay. Features can vary from mild to more marked.
Outlook and prognosis
In primary autosomal dominant microcephaly 18, head size stays smaller than expected, and learning or developmental differences often continue into adult life. Outlook varies, but many living with primary autosomal dominant microcephaly 18 benefit from early therapies, education support, and regular developmental follow-up.
Causes and risk factors
Primary autosomal dominant microcephaly 18 is caused by a change in one copy of the gene. It is usually inherited from an affected parent, though a new change can happen. Lifestyle and environmental factors do not cause it.
Genetic influences
Genetics are central to Primary autosomal dominant microcephaly 18. It is caused by a disease-causing change in one copy of a specific gene, so genetic testing can confirm the diagnosis and help guide family counseling.
Diagnosis
Primary autosomal dominant microcephaly 18 is usually diagnosed from clinical features such as a small head size and developmental findings, then confirmed with genetic tests. Imaging may also help, and the genetic diagnosis of Primary autosomal dominant microcephaly 18 can clarify the cause.
Treatment and drugs
Primary autosomal dominant microcephaly 18 is managed with regular developmental checks and support for feeding, movement, learning, and speech. Many children benefit from early physical, occupational, and speech therapy. Seizures or other complications are treated as they arise.
Symptoms
Many living with Primary autosomal dominant microcephaly 18 have a head size that is smaller than expected for age and sex, and this is often one of the first signs noticed during routine measurements. The changes are often subtle at first, blending into daily life until they become more noticeable. In some children, the early features of Primary autosomal dominant microcephaly 18 also include delays in speech, movement, or learning. How much it affects daily life can differ a lot, so some people need only monitoring and school support, while others need broader developmental care.
Head growth is below the usual range for age and sex, and this may be present at birth or become clearer over time. It is often picked up during routine measurements rather than causing a specific feeling or discomfort.
Sitting, standing, walking, or other early movement skills can happen later than expected. In daily life, this can show up as extra difficulty with stairs, playground activities, or tasks that need steady coordination.
First words and sentence-building may come later, and some children have trouble expressing themselves clearly. Conversations, classroom tasks, and following multi-step instructions can take more effort.
Some people with Primary autosomal dominant microcephaly 18 learn new information more slowly or need more repetition. The range is broad, from mild school challenges to more significant intellectual disability.
How people usually first notice Primary autosomal dominant microcephaly 18?
The first signs of primary autosomal dominant microcephaly 18 are usually noticed when a baby’s head is smaller than expected, either on a prenatal ultrasound or during routine checkups after birth when head growth falls below the usual curve. As infancy and early childhood unfold, families and doctors may also notice delayed development, speech or learning challenges, or other neurologic differences, although the pattern can vary from one child to another. In many living with this condition, it is first recognized through these early growth and developmental signs, with genetic testing helping confirm the diagnosis.
Types of Primary autosomal dominant microcephaly 18
No distinct types of Primary autosomal dominant microcephaly 18 are widely recognized.
Can I slow down the onset of symptoms?
No. For primary autosomal dominant microcephaly 18, there is no good evidence that lifestyle changes or medical treatment can meaningfully delay when symptoms begin, because this is a rare inherited condition that affects brain growth very early, often before birth. Early medical follow-up, developmental support, and genetic counseling can still be very helpful for planning care and family decisions, but they do not prevent the condition or stop it from starting; research is ongoing, but there is no proven way at this time to slow onset.
What genetics can tell you about symptoms
In primary autosomal dominant microcephaly 18, genetic testing can help confirm the cause and may offer some clues about the pattern of symptoms, especially a smaller-than-expected head size and differences in brain development that often begin before birth or are noticed in infancy. Many living with this condition can have a range of related features, such as developmental delay, learning difficulties, or seizures, and the exact mix and severity may vary even among relatives with the same genetic change. So while genetics can point to the diagnosis and suggest what doctors should watch for, it usually cannot predict exactly how mild or severe symptoms will be for any one person.
Causes and risk factors
In primary autosomal dominant microcephaly 18, the underlying cause is a harmful gene change that affects brain growth before birth. This gene change can be inherited from an affected parent, or it can happen for the first time in a child. The main risk factor is a family history of primary autosomal dominant microcephaly 18, and each child of an affected parent may have a 1 in 2, or 50%, chance of inheriting it. Knowing your family history is a good first step. Lifestyle or environmental factors do not cause primary autosomal dominant microcephaly 18, but good prenatal care and avoiding harmful exposures in pregnancy can still support overall fetal development.
What are the most common causes or risk factors?
The main cause of primary autosomal dominant microcephaly 18 is a change in a single gene that affects early brain growth, and this change may be passed down from an affected parent or happen for the first time in the child. The main risk factor is family history, because in an autosomal dominant condition, a parent with the gene change has a 1 in 2, or 50%, chance of passing it on in each pregnancy. Unlike more common forms of a small head size, there are no well-established lifestyle or environmental risk factors known to cause this specific inherited condition.
Environmental and biological risk factors
Primary autosomal dominant microcephaly 18 is a rare congenital condition, and at this time there are no well-established environmental or non-genetic biological risk factors that clearly increase the chance of it occurring. Most reported cases appear to begin very early in development, so common pregnancy exposures linked to microcephaly in general should not automatically be treated as risk factors for this specific condition. If Primary autosomal dominant microcephaly 18 is being discussed in your family, a genetics specialist can help explain what is known, what is uncertain, and how this differs from other causes of microcephaly.
Genetic risk factors
For families trying to understand why a baby was born with a smaller head size, Primary autosomal dominant microcephaly 18 is linked to a change in a gene involved in early brain development. Some risk factors are inherited through our genes. When people ask about the genetic causes of Primary autosomal dominant microcephaly 18, the key questions are whether the change is in WDFY3, whether it was inherited from a parent, or whether it started for the first time in the child.
WDFY3 variants: Primary autosomal dominant microcephaly 18 is most clearly linked to harmful changes in WDFY3, a gene that helps guide early brain growth. When this gene is not working as expected, head growth can be smaller than usual from before birth.
Dominant inheritance: For Primary autosomal dominant microcephaly 18, one altered copy of the gene is enough to cause the condition. If a parent carries the variant, each child has a 1 in 2, or 50%, chance of inheriting it.
New variant: In some families, the genetic change happens for the first time in the child and is not found in either parent. This is called a de novo change and can explain why there is no family history of Primary autosomal dominant microcephaly 18.
Germline mosaicism: Rarely, a parent can carry the change in some egg or sperm cells even when their blood test is normal. This means the chance of the condition happening again is usually low, but not zero.
Lifestyle risk factors
Primary autosomal dominant microcephaly 18 is a genetic condition, so lifestyle habits do not cause it. However, how lifestyle affects Primary autosomal dominant microcephaly 18 can matter for day-to-day function, growth, comfort, and the risk of complications. The most relevant lifestyle risk factors for Primary autosomal dominant microcephaly 18 are usually the routines that shape nutrition, movement, sleep, developmental support, and overall health stability.
Poor intake, unbalanced nutrition, or untreated feeding difficulties can worsen growth, low energy, and developmental progress in a child with Primary autosomal dominant microcephaly 18. Regular meals, adequate calories, and early feeding support may help protect growth and strength.
Too little movement can contribute to weak muscle tone, poor coordination, constipation, and loss of function over time. Safe, regular activity matched to the child's abilities may support mobility, balance, and participation in daily life.
Irregular sleep, frequent sleep loss, or untreated sleep problems can make irritability, attention difficulties, and daytime function worse. A consistent sleep schedule may improve behavior, learning, and family coping.
Inconsistent practice of physical, occupational, or speech therapy strategies at home can limit developmental gains. Daily repetition of communication, motor, and self-care skills often helps children with neurodevelopmental conditions make better use of their abilities.
Risk prevention
Primary autosomal dominant microcephaly 18 is an inherited condition, so there is no proven way to prevent the condition itself once the gene change is present. For many families, prevention is really about understanding genetic risk before pregnancy and reducing health and developmental complications after birth. Different people need different prevention strategies—there’s no single formula. In practice, that often means family planning support, careful prenatal care, and early steps to prevent complications of Primary autosomal dominant microcephaly 18.
If Primary autosomal dominant microcephaly 18 has been diagnosed in a family, genetic counseling can help clarify the chance of passing it on. This can support informed family planning decisions, including whether to pursue testing before or during pregnancy.
When a disease-causing variant is known, testing relatives may show who carries it and who does not. This does not change the gene itself, but it can reduce uncertainty and help families plan early care.
Good prenatal care cannot prevent Primary autosomal dominant microcephaly 18 itself, but it can lower other pregnancy risks that may affect a baby's health. Avoiding alcohol, smoking, and certain infections, and reviewing medicines with a clinician, are sensible protective steps.
Early developmental care may help many living with Primary autosomal dominant microcephaly 18 build skills and avoid secondary problems. Physical, occupational, and speech therapy are often most helpful when started promptly if delays appear.
Can you prevent Primary autosomal dominant microcephaly 18?
No, this condition cannot usually be prevented, because it is caused by a change in a gene and is often inherited from a parent. If it runs in your family, genetic counseling before pregnancy can help you understand the chance of passing it on and talk through testing and family planning options.
Transmission
Primary autosomal dominant microcephaly 18 is not infectious, so it cannot be caught from someone through the air, touch, food, sex, or blood. Instead, the genetic transmission of Primary autosomal dominant microcephaly 18 happens through genes passed from parent to child.
Because it is autosomal dominant, a parent who carries the altered gene has a 1 in 2, or 50%, chance of passing it on in each pregnancy. In some families, Primary autosomal dominant microcephaly 18 starts with a new genetic change in the child, which means neither parent is affected.
When to test your genes
Genetic testing for primary autosomal dominant microcephaly 18 is most useful when a baby or child has a clearly small head size, especially with developmental differences, or when there is a family history of microcephaly. It can confirm the cause, guide developmental monitoring, and help with future pregnancy planning for relatives.
Diagnosis
Primary autosomal dominant microcephaly 18 is usually suspected when a baby or child has a smaller-than-expected head size, often along with differences in growth or development that prompt a closer medical review. The genetic diagnosis of Primary autosomal dominant microcephaly 18 is based on these clinical features and then confirmed with testing that looks for the underlying gene change. Getting a diagnosis is often a turning point toward answers and support.
Doctors carefully measure head circumference and compare it with age- and sex-based growth charts. A persistently small head size helps raise suspicion for Primary autosomal dominant microcephaly 18, especially when tracked over time.
Doctors look at the overall pattern of features, including growth, development, and any physical findings seen on examination. This helps show whether the small head size fits an isolated pattern or is part of a broader genetic condition.
In some families, ultrasound during pregnancy may show that the baby's head is measuring smaller than expected. These imaging findings can suggest a concern, but they usually cannot confirm Primary autosomal dominant microcephaly 18 on their own.
Your provider may suggest brain imaging, such as ultrasound in infancy or MRI, to look closer. These tests can help check brain structure and rule out other causes of microcephaly.
How is Primary autosomal dominant microcephaly 18 diagnosed?
Primary autosomal dominant microcephaly 18 is usually diagnosed by finding that a child’s head is much smaller than expected for age and sex on repeated measurements, along with a review of growth, development, and family history. Doctors may also do a physical exam and sometimes brain scans or other tests to rule out more common causes of a small head size. Genetic testing can help confirm the diagnosis by finding the gene change linked to this condition, especially when the pattern in a family suggests it runs from one generation to the next.
Stages of Primary autosomal dominant microcephaly 18
Primary autosomal dominant microcephaly 18 does not have defined progression stages. This is because it is usually a genetic brain growth condition that is present from early development, rather than an illness that predictably moves from one stage to another over time. Often the process begins when you notice changes in daily life, such as a baby or child having a smaller-than-expected head size or developmental differences, and doctors usually confirm the diagnosis with growth measurements, developmental assessment, brain imaging in some cases, and genetic testing. Monitoring usually focuses on head growth, learning and development, and any early symptoms of primary autosomal dominant microcephaly 18 that may affect daily life.
Outlook and prognosis
The outlook for people with primary autosomal dominant microcephaly 18 is variable, but it is generally a lifelong neurodevelopmental condition rather than a progressive degenerative disorder. Most affected individuals are expected to survive into adulthood, and there is no well-established evidence that the condition by itself markedly shortens life expectancy. Prognosis is driven mainly by the severity of microcephaly, developmental delay or intellectual disability, speech and motor impairment, and any associated problems such as seizures, feeding difficulties, or behavioral challenges. Many children benefit from early supportive care, including developmental, speech, physical, and occupational therapies, which can improve function and quality of life. Because this is a very rare disorder, published long-term outcome and mortality data remain limited.
Long-term effects
For many living with Primary autosomal dominant microcephaly 18, the main long-term effects relate to brain development, learning, and day-to-day independence rather than a steadily worsening disease course. Features can vary, but many continue to have a smaller head size, developmental differences, and ongoing support needs from childhood into adult life. The long-term picture is often shaped by how strongly movement, speech, and thinking skills are affected in each individual. It is important to remember that long-term does not always mean progressive.
A smaller-than-expected head size usually remains a lifelong feature of Primary autosomal dominant microcephaly 18. As a child grows, the gap between head size and average measurements often stays noticeable even when overall health is stable.
Many people with Primary autosomal dominant microcephaly 18 have long-term differences in learning, problem-solving, and adaptive skills. This can affect school progress in childhood and later influence how much help is needed with money, travel, or daily planning.
Speech and language may develop slowly, and some people continue to have trouble expressing themselves clearly. For many, symptoms are not about pain or illness but about how easily they can communicate needs, follow conversation, or use language in daily life.
Some may have lasting difficulties with balance, coordination, or fine hand movements. In everyday life, this can mean taking longer with handwriting, buttons, utensils, or activities that need steady control.
How is it to live with Primary autosomal dominant microcephaly 18?
Living with primary autosomal dominant microcephaly 18 often means growing up with a head size that is smaller than expected, and for some people this also comes with delays in speech, learning, or motor skills, while others may be more mildly affected. In daily life, this can mean needing early developmental support, therapy, extra help at school, and regular check-ins with specialists to track progress. For families and other close supporters, the condition can bring extra caregiving, appointments, and advocacy, but with steady support, many children continue to learn, connect, and develop in their own way.
Treatment and drugs
There is no treatment that can change the underlying gene change in Primary autosomal dominant microcephaly 18, so care focuses on a child’s day-to-day needs, development, and any related medical problems. Treatment often looks different for each person, but many living with Primary autosomal dominant microcephaly 18 benefit from regular follow-up with specialists and supportive therapies such as physical, occupational, speech, and learning support. If a child has concerns such as seizures, feeding difficulties, delayed development, or muscle tone problems, doctors treat those symptoms directly with standard medicines, nutrition support, and therapy plans. Because needs can change over time, early treatment for Primary autosomal dominant microcephaly 18 and ongoing checkups can help families adjust care as the child grows.
Can you cure Primary autosomal dominant microcephaly 18?
No, there is currently no cure for primary autosomal dominant microcephaly 18, a genetic condition linked to a smaller-than-expected head size. Treatment cannot change the underlying genetic cause, but it can help support a child’s development and manage any related challenges, such as learning, movement, or speech difficulties. Care is usually based on the person’s needs and may include early support services, therapy, and regular checkups.
Non-drug treatment
Daily care for people living with Primary autosomal dominant microcephaly 18 usually centers on development, learning, movement, and family support rather than a cure. Non-drug treatments may be recommended early, because the condition can affect brain growth and lead to delays that show up in infancy or early childhood. For many, this can mean help with communication, motor skills, feeding, and school participation, with plans adjusted over time. Not every approach works the same way, so care is usually tailored to a child’s needs and the early symptoms of Primary autosomal dominant microcephaly 18.
Developmental support started in infancy or the toddler years can help build skills during a key period of brain development. This may include play-based therapy, parent coaching, and regular reviews to track progress.
Physical therapy can help with balance, posture, strength, and everyday movement. For children who are late to sit, stand, or walk, regular practice can make daily activities safer and easier.
Occupational therapy focuses on hand use, self-care, and sensory challenges that can affect dressing, feeding, and play. Some strategies can slip naturally into your routine—like practicing grasping during meals or using easier-to-hold tools.
Speech and language therapy can support communication, understanding, and social interaction. If talking is very limited, therapists may introduce picture boards or communication devices so children can express needs more easily.
Your genes may have an impact on how drugs work for you
For people living with primary autosomal dominant microcephaly 18, medicines are usually chosen to help with day-to-day problems such as seizures, muscle stiffness, sleep troubles, or behavior and learning challenges, and the response can vary from one person to another. Right now, there is no well-established evidence that this condition itself gives a clear, special pattern of how the body handles these medicines, so treatment is usually guided by symptoms, age, side effects, and how well the medicine works over time. In practice, this means one child may do well on a medicine while another may need a different dose or a different option, with careful follow-up to find the safest and most helpful plan.
Pharmacological treatments
There is no medicine that can make head size or brain growth return to typical in primary autosomal dominant microcephaly 18. Treatment for primary autosomal dominant microcephaly 18 is usually supportive and depends on the problems someone is actually having, such as seizures, muscle stiffness, attention difficulties, or sleep trouble. Not everyone responds to the same medication in the same way, so doctors tailor treatment to the person rather than the genetic diagnosis alone.
If epilepsy is part of primary autosomal dominant microcephaly 18, doctors often use standard anti-seizure medicines such as levetiracetam, valproate, lamotrigine, or clobazam. The choice depends on seizure type, age, side effects, and other health needs.
When tight or stiff muscles interfere with walking, dressing, or comfort, medicines such as baclofen, diazepam, or tizanidine may be used. In more focused muscle groups, botulinum toxin injections can sometimes help reduce stiffness.
Some people with abnormal movements may be treated with medicines such as trihexyphenidyl, clonazepam, or baclofen, depending on whether dystonia or muscle overactivity is the main issue. These drugs do not treat the underlying genetic change, but they may ease day-to-day function.
If attention-deficit or hyperactivity symptoms are present, doctors may consider stimulants such as methylphenidate or amphetamine-based medicines, or nonstimulants such as atomoxetine or guanfacine. Starting a new prescription can bring questions, so families are usually asked to watch appetite, sleep, mood, and school or daily functioning.
Genetic influences
For families facing a baby whose head size is much smaller than expected from the start, primary autosomal dominant microcephaly 18 is caused by a genetic change that affects early brain growth before birth. The autosomal dominant part of the name means that one altered copy of the disease-causing gene is enough to cause primary autosomal dominant microcephaly 18, so an affected parent has a 50% chance of passing it to each child. In some families, the change is inherited, while in others it appears for the first time in the child and was not present in either parent. Even within the same family, the effects can vary, so one relative may have milder differences while another has more noticeable microcephaly or developmental challenges. To put these pieces together, doctors may suggest genetic counseling and, when appropriate, genetic testing.
Is Primary autosomal dominant microcephaly 18 genetic?
Genetics are central to Primary autosomal dominant microcephaly 18. It is caused by a disease-causing change in one copy of a specific gene, so genetic testing can confirm the diagnosis and help guide family counseling.
Having a genetic risk is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are common across the general population. Most do not have a direct effect on health and simply reflect natural human diversity. For many genes, having a variant associated with a condition points to a possible link rather than a definite diagnosis, especially when several genes and environmental factors play a role. In some cases, though, a single well-characterized variant in a specific gene is enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
When families ask how genetics affect treatment for primary autosomal dominant microcephaly 18, the answer is usually more about guiding care than matching someone to one specific drug. The genetic finding helps confirm the diagnosis and can give doctors a clearer sense of which developmental or medical concerns to monitor, which may shape therapy plans, follow-up, and referrals. There is not currently a proven medicine that corrects the underlying genetic change in primary autosomal dominant microcephaly 18, so treatment is mainly supportive and based on each person’s needs. Not every difference in response is genetic, but a confirmed diagnosis can still help doctors choose medicines more carefully for associated symptoms, while also considering age, growth, other health conditions, and possible side effects. For many, this can mean regular review over time, because the most helpful treatments may change as a child grows. Genetic counseling can also help families understand what the result means for future pregnancies and what it does, and does not, change about treatment.
Interactions with other conditions
For many living with Primary autosomal dominant microcephaly 18, day-to-day challenges are usually tied less to other separate diseases and more to the condition’s own effects on brain growth and development. Early symptoms of Primary autosomal dominant microcephaly 18 can overlap with problems such as developmental delay, learning difficulties, seizures, or low muscle tone, so care often involves watching how these issues affect each other over time. If seizures are present, for example, they can make attention, sleep, and daily functioning harder, and feeding or growth problems may add another layer of stress for families. Interactions can look very different from person to person. At this point, there are no well-established disease pairings that are considered a defining part of Primary autosomal dominant microcephaly 18, but doctors still look closely for related neurologic and developmental conditions that may need treatment. This is why regular follow-up with a pediatric neurologist, developmental specialist, and primary care team can be important.
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 Primary autosomal dominant microcephaly 18?
Doctors may also consider other inherited conditions that can cause a baby to have a smaller-than-expected head, slower development, learning problems, or seizures, along with more common causes of a small head size such as infections during pregnancy, alcohol or certain drug exposure before birth, and reduced oxygen to the brain around the time of birth. In some children, conditions that affect early brain development, including cerebral palsy, can seem similar at first. Brain scans and genetic testing can help tell these causes apart.
History
For many families, the history of Primary autosomal dominant microcephaly 18 is fairly recent. This is not a condition that appears often in older medical writing under its current name, and for a long time, people living with it would more likely have been described by individual features, such as a smaller-than-expected head size, learning differences, or delays in development, rather than as having one clearly recognized diagnosis.
In recent decades, awareness has grown as doctors became better at grouping these patterns together and comparing people with similar features. A child might first come to medical attention because their head growth is slower than expected at routine checkups, while another family may seek answers after noticing developmental delays or speech differences. Earlier on, these findings were often recorded separately, which made rare conditions like Primary autosomal dominant microcephaly 18 harder to identify.
As medical genetics improved, researchers were able to sort some of these rare disorders into more specific categories. That changed the picture in an important way. Instead of viewing each case as unexplained, doctors could begin to recognize that some families shared a distinct condition with a similar set of features. This helped Primary autosomal dominant microcephaly 18 move from being a loosely described clinical pattern to a more clearly defined diagnosis.
The history of Primary autosomal dominant microcephaly 18 also reflects a broader shift in medicine. In the past, many rare conditions were named and understood mainly by what doctors could see during an exam. More recently, careful follow-up, brain development research, and genetic testing have made it easier to confirm diagnoses and separate one rare syndrome from another. That matters in everyday life, because getting the right diagnosis can help families understand what the early symptoms of Primary autosomal dominant microcephaly 18 may mean and what kinds of support may be helpful.
Because Primary autosomal dominant microcephaly 18 is very rare, its published history is still limited compared with more common conditions. Even so, the growing ability to recognize rare neurodevelopmental disorders has made diagnosis more accurate and has given families clearer information than was available in the past.