Developmental disorders are considered incompatible with life when essential structures or biological functions necessary for the preservation of life are not formed; they may result in spontaneous abortion, stillbirth, or neonatal death. Examples of conditions generally considered incompatible with life include Potter's syndrome and anencephaly.[3] Where disorders incompatible with life are found before birth, patients may elect to have an induced abortion.[4]
The definition of which conditions are incompatible with life can change as medicine advances, such as where medical techniques have made it possible for some people born with some conditions generally regarded as incompatible with life such as Potter's syndrome to survive.[5][6] There have even been extremely rare cases of short-term survival into infancy with conditions as severe as anencephaly.[7] However, others remain beyond help.