Q: I had my baby eight weeks ago and would like to get back into my running routine. Will exercise change the taste of my breast milk?
A: Probably not enough to cause your baby any concern. If you were to exercise very heavily, your body would produce sufficient lactic acid to affect the taste of your milk a bit, but even so, your baby would likely not reject it. Normal exercise, on the other hand--running a few miles, hiking for an hour, or playing a game of soccer--will cause minimal lactic acid to accumulate in your body and thus no change in your milk's taste.
Regular vigorous exercise will improve your state of mind, keep your body strong and help with weight loss. Just be sure to ease back slowly. Also, to keep your milk production at its highest, stay hydrated and make sure you're eating well.