Colostrum - Definition

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Colostrum is the liquid produced by the mammary glands during the last phase of pregnancy and the first days following childbirth. The liquid is thick and yellowish. It is extremely rich in substances required by infants, notably proteins, but also antibodies, cells that strengthen the newborn organism's immune defense, as the immune system of the baby is still immature and insufficient at birth. Its production generally ends around the third day after childbirth, and the colostrum is gradually replaced by breast milk, more rich in fat.