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 Your body begins making colostrum in your second trimester, and while it's possible to leak then, it's most common toward the end of your third trimester. Learn why some women experience milk or colostrum leakage during pregnancy Understand when it’s normal, what it indicates, and when to consult your healthcare provider. Leaking milk during pregnancy, also known as colostrum leakage, is a common phenomenon that many expectant mothers experience While it can be a sign of the body preparing for breastfeeding, it can also be unexpected and sometimes cause discomfort or embarrassment.
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. When does milk start leaking during pregnancy While your body begins to make milk late in the first trimester, your breasts don't start developing the ability to secrete it until the second.
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