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Socioeconomic differences in birth weight have narrowed since 1900. The mother's nutritional status during her growing years, proxied by height, accounted for most of the differences in the past, but not today. Children born at the beginning of this century compared favorably to modem populations in terms of birth weights, but suffered high fetal and neonatal death rates. By day ten children in the past were at a disadvantage because best practice resulted in insufficient feeding. Improved obstetrical, medical, and nutritional knowledge has increased weight in the first days of life, which may account for increased adult stature.