Abstract
We have presented size and growth velocity data for weight, length, pelvic breadth, and head and chest circumference during the first year of life in Negro infants observed in a well-baby clinic. The subjects were normal, healthy infants of families in the lower middle economic class. We have compared our data with similar data representing two white and two Negro samples studied by other investigators. In general, pelvic breadth, and head and chest circumference were found to be slightly larger in the white than in the Negro samples. For pelvic breadth and chest circumference, the annual growth velocities were higher in the white than in the Negro samples. Growth in pelvic breadth was found to decelerate more rapidly in the white than in the Negro samples. However, we verified no statistically significant difference by race. In general, the males of both races were larger in all dimensions than the females. The males showed the higher annual growth velocities. Growth was found to decelerate more rapidly in the males than in the females. In general, whenever any two groups were compared, it was found that growth decelerated more rapidly in the one with the higher first-quarter growth velocity. This was true in 42 of 45 comparisons.
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