Vital and health statistics: Series 21, Data from National Vital Statistics System. 8. Weight at birth and survival of newborn. United States, early 1950, statistics derived from vital records on neonatal mortality by weight at birth and gestation age, by color and sex, to Infants born in United States during 1st 3 months of 1950 [with list of references; by Sam Shapiro and Jeanne Unger].