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. Learn about the stages of breast milk production, early signs like leaking colostrum and breast changes, and what affects timing—including hormones, stretch marks, and more Discover the normal timeline for milk leakage during pregnancy Learn why it happens, what to expect, and when to seek advice. Your breasts will start preparing for breastfeeding throughout your pregnancy, so there might be moments you notice leaking breast milk in the later trimesters.
Why are your breasts leaking during pregnancy 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.
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