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Global web icon Cleveland Clinic https://my.clevelandclinic.org › health › body Colostrum: What Is It, Benefits & What To Expect - Cleveland Clinic Colostrum (kuh-loss-trum) is the first milk your body produces during pregnancy. It forms in your mammary glands (breasts) and plays an important role in building your baby's immune system. If you plan on breastfeeding(nursing or chestfeeding), it's the first milk your baby will get from your breasts. If you don't want to … See more What Is Colostrum Made of? Colostrum is high in protein and low in fat and sugar. It's filled with white blood cells that produce antibodies. These antibodies strengthen your baby's immune … See more What's The Difference Between Colostrum and Breast Milk? Colostrum is a nutrient-rich first milk produced by your breasts during pregnancy. It changes to transitional breast milk a few days after your baby is born. However, … See more When Does Colostrum Turn to Milk? After approximately three or four days, colostrum will turn to transitional milk. This is often referred to as someone's milk "coming in." Your breasts will feel firm, … See more....