Abstract
The effect of maternal age, parity, and cigarette smoking on the weight and sex of the baby and on the incidence of abnormal births and congenital deformities has been studied in 3,681 mothers. Increasing age and parity increase the risk of abnormal births and, possibly, of congenital deformities. Babies born to mothers over 35 years of age tend to be lighter, but this is not an effect of parity. Smoking mothers are significantly more likely to have light babies and abnormal births. Smoking does not appear to affect the sex of the baby or the incidence of congenital deformities. The mode of action of the effect of smoking upon the baby is discussed.
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