Many women wonder if they can continue to run if they choose to breastfeed their babies.
The answer is yes. Exercise does not seem to affect the quantity or quality of a mother's milk. There was a study done by Janet Wallace, et al at the Adult Fitness Program at Indiana University at Bloomington that raised some concerns about breast-feeding and exercise. Wallace and her group studied 26 nursing mothers and their babies, measuring lactic acid concentrations in milk samples obtained before and up to 30 minutes after maximal exercise and comparing infant reactions to the samples. The problem with the study is that the samples were given by bottle and many breastfed babies won't take a bottle if they are not used to having one.