Colostrum: A sticky white or yellow fluid secreted by the breasts during the second half of pregnancy and for a few days after birth, before breast milk comes in. It is high in protective antibodies that boost the newborn's immune system.

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Colostrum: A sticky white or yellow fluid secreted by the breasts during the second half of pregnancy and for a few days after birth, before breast milk comes in. It is high in protective antibodies that boost the newborn's immune system.