Female mammary glands undergo differentiation during pregnancy, and the process known as lactation causes them to begin producing milk around the end of pregnancy. In order to feed the newborn, this aids the mother. Colostrum, the milk produced during the first few days of lactation, contains many antibodies (primary antibody is ) that are crucial for the development of resistance in newborns. Doctors advise breastfeeding during the early stages of an infant's development to ensure a healthy upbringing.

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