Only one long-term study has ever been done on the effects of day care and this by Moore in 1975. His findings were largely negative.
Boys reared in substitute care were more aggressive, nonconforming and less interested in academic subjects than boys reared at home. Girls reared in substitute care were nostalgic about childhood, while girls reared at home by their mothers were active, positive in their attitudes toward the opposite sex and well adjusted socially.
Even Harvards Kagan, himself an advocate for day care, has said of day cares children, “I think they will be different, but I cant say how.”