When your baby is first born, you’ll produce a small amount of colostrum, an antibody-rich substance. (You’ll actually start producing this in late pregnancy.) Over the first few days, as you nurse, your body will eventually (in theory) switch over from producing colostrum to producing milk in more copious amounts. The expectation is that this switch to more full milk production—scientifically termed lactogenesis II, and sometimes referred to as your milk “coming in”—will occur within the first seventy-two hours after you’ve given birth. If this doesn’t happen, you will be deemed as having
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