A collection of syndromes (not a disease) of nonprogressive motor dysfunction arising from abnormal development of or damage to the brain, either prenatally, at birth, or postnatally. Most cases of cerebral palsy develop in utero. Premature birth is associated with an increased risk of cerebral palsy, with the lowest birth weights carrying the highest risk. A maximum of 15% of cases are related to birth injury or perinatal oxygen deprivation.