Results
There were no significant differences in the base-line characteristics of the women in the exercise group (n = 18) and the control group (n = 15) (Table 1Table 1Characteristics of the Women at Base Line.). Because the proportion of female infants was somewhat higher in the exercise group than in the control group, the infants' weight at base line averaged 327 g less in the exercise group. All infants were exclusively breast-fed throughout the study.