Educational outcome of former very low birth weight infants, greater than or equal to 1250 g., were obtained by a questionnaire mailed to the families' last known address. Fifty-seven infants were known to have survived the first year of life and an address was available for 49 families, 51 infants (two sets of twins). Forty families (82%) responded regarding 42 of the 57 infants (74%). Only one child had a major health problem, cerebral palsy and epilepsy. All the children were in school. Thirty-nine (93%) were in a regular class and three (7%) were in special classes. Twenty-six children (67%) in a regular class did not require special educational assistance, 13 (33%) did. Using the Hollingshead Four Factor Index, socioeconomic status affected outcome P = 0.0068 (Fischer's exact test). There were 20 children in Classes I-III, upper socioeconomic and three children Class IV-V, lower socioeconomic, requiring no special education and six children in Class I-III and eight children in Class IV-V requiring special education. The neonatal risk factors birth weight, gestational age, appropriateness of weight for gestation, Apgar score, time to regain birth weight, and time on mechanical ventilation did not affect outcome. The only neonatal risk which was significantly different between the respondents and nonrespondents was birth weight, P less than 0.020 for the children in a regular class without assistance and P less than 0.005 for children in a regular class with assistance. Overall, 40 percent of the children had repeated a grade.(ABSTRACT TRUNCATED AT 250 WORDS)