When do your breasts start to leak during pregnancy? Colostrum production can begin as early as the second trimester. Leaking varies widely;

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 … You may start noticing yellow or orange stains on your bra starting from your second trimester. This is colostrum, or “first milk,” leaking from your nipples. However, some women may not … Typically, milk leakage starts during the second trimester, around 16 to 24 weeks of pregnancy. However, some women may experience it earlier or later, and in some cases, not at all before birth.

Typically, milk leakage starts during the second trimester, around 16 to 24 weeks of pregnancy. However, some women may experience it earlier or later, and in some cases, not at all before birth.