Cerebral palsy affects about two in every 1000 liveborn infants, but the birth prevalence is some 20–80 times higher among very low birthweight (VLBW, <1500 g) infants than among infants with a birthweight >2500 g. There is evidence that in industrialised societies the prevalence and severity of cerebral palsy among VLBW infants increased during the 1980s, but both may have fallen since then. With improved …