Some people notice a yellow, white, or clear liquid leaking from their nipples during pregnancy It might happen when their nipple is stimulated, their breast is squeezed, or for no reason at. Your breasts are leaking during pregnancy because prolactin, the hormone responsible for milk production after the birth of your baby, starts revving up while you're still pregnant, usually in the third trimester. Learn the signs that indicate your breast milk is coming in during pregnancy Discover when lactation starts, what changes to expect, and how to manage leaking breast milk. Pregnant moms start producing small amounts of colostrum as early as three or four months into pregnancy
(you may have noticed your breasts becoming bigger before that, as your milk glands increase in number and size.) When does breast milk come in during pregnancy Your body typically begins producing breast milk before your baby is born This starts with colostrum, a thick, yellowish fluid that starts forming as early as 16 weeks into pregnancy. In pregnancy, the breasts may start to produce milk weeks or months before you are due to have your baby If your nipples are leaking, the substance is usually colostrum, which is the first milk your breasts make in preparation for feeding your baby