Early development of infants 1000 g or less at birth.

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Abstract
In a 4-year period the neonatal survival rate for 26 infants weighing 501-750 g was 42% and for 81 infants weighing 751-1000 g it was 61%. All 59 surviving infants have been assessed at follow-up; 39 were at least 2 years old (corrected for prematurity) and data from the remaining 20 were derived from assessment at 1 year corrected age. Five children had cerebral palsy, 4 had multiple handicaps, 4 each had a sensory handicap, 2 had developmental delay, and 1 had a dilated right ventricle without clinical hydrocephalus. Twelve of the 16 children with defined handicaps were considered to have significant functional handicaps. Therefore, of the 107 infants in this series, 48 (45%) died, 12 (11%) survived with significant functional handicaps, and 47 (44%) were considered to be developing within the normal range. No significant differences in the incidence of handicap were observed between inborn and outborn children, boys or girls, those who were small or appropriate for gestation, those who weighed less than or equal to 750 g or greater than 750 g at birth, and those who required or did not require prolonged oxygen or ventilation.