The early weeks of pregnancy are fragile—and confusing. Here, the answers to your questions.
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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.