Abstract
Summary The average intelligence, as measured by the Stanford-Binet Scale, of a group of sixty-eight children recovered from erythroblastosis fetalis without suffering obvious motor nerve damage was found to be lower than that of their unaffected older brothers and sisters. Statistical analysis indicates that the inferiority is not likely to have resulted from chance nor from the circumstance that the affected child was always younger than his control sibling. The extent of the impairment is slight, the mean difference in I. Q. being only 11.8, so that there is no occasion for altering the usual custom of giving a good prognosis to the parents of a child who has apparently recovered from erythroblastosis without suffering motor nerve injury. The data presented do not distinguish between a specific effect of the Rh antibody and a nonspecific one such as might be operating in any illness in the newborn period.
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