Acheiria, the congenital absence of one or more hands, is usually first noticed on prenatal ultrasound, where a clinician may see that part of a limb has not formed, or at birth when the missing hand is immediately visible. For many families, the first signs of Acheiria also include how a newborn positions their arm or reaches differently, prompting doctors to check limb bones and surrounding muscles and joints. When it isn’t seen prenatally, how Acheiria is first noticed is typically at delivery or during the first newborn exam, followed by imaging and referrals to assess function and plan early support.