Women who exercise above the recommended levels during the first trimester of pregnancy—that is, about 33 minutes of brisk walking or more every day—are at increased risk of delivering small-for-gestational-age infants and decreased risk of delivering large-for-gestational-age infants, according to a new study published in the American Journal of Epidemiology and authored by Samantha Ehrlich, a reproductive and perinatal epidemiologist at the University of Tennessee, Knoxville.
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