\ follow-up study was performed in a group of 77 children who were considered to be "neurological high risk" patients during their neonatal period. \ control group of 24 children was equally studied. Development was evaluated in both groups using the R. Griffith's "Mental Development Test", the results being expressed in 4 developmental levels: normal, mild, moderate and profound retardation. Development was found to be normal in 20183.3^) and mildly retarded in 4116.7^ I of children in the control group. In the high risk group there were 55 normal children I71.4T). 10 were mildly retarded i\'i r i). 9 cases 111.7^) has moderate, and 3 l3.9 r r) had profound developmental retardation. Results in the study group did not differ significantly from those in the control group. Developmental levels in children whose birth weight was under 1 501 gr) 56 cases), with low birth weight for their gestational age (23 children!, or who had neonatal hypoglycemia (22 cases) were not significantly different from the control group. However development was found to be normal in 89.7^ of children whose families had a high or intermediate socioeconomic level and only in 52.6*~f of those from lower socioeconomic level. The difference between these two subgroups was significant.