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Researchers conducted a population-based, prospective cohort study to determine if regular exercise before and during pregnancy is associated with or prevents excessive birth weight in newborns (defined as 4170 g and 4362 g for offspring of nulliparous and multiparous women, respectively). More than 36,000 women in Norway with singleton pregnancies reported how often they engaged in various types of exercise during weeks 17 and 30 of pregnancy (as well as 3 months before pregnancy). Birth weights were obtained from a medical birth registry.
Mean newborn birth weight was 3682 g. Multiparous women were more likely than nulliparous women to be overweight, not to exercise, and to deliver infants with excessive birth weights. Overall, regular exe…