New data on black infant precocity

The theory that black infants are developmentally advanced, as compared with white, during the first 15 months of life, was examined by comparing the means obtained by black infants on the South African standardisation sample of the Bayley Scales of Infant Development with the means of white American infants obtained on the American standardisation sample. It was found that black infants are significantly advanced in both motor and mental development up to the age of 15 months. From 18–30 months, there are no differences between the two groups.