Give scientific reasons: Doctors advise breastfeeding to mothers for infants.

(N/A) After parturition,milk production begins in the mammary glands of females. The first milk produced by the mammary glands immediately after childbirth is called colostrum. Colostrum contains essential antibodies,such as $IgA$,which provide passive immunity to the newborn. It is crucial for the healthy development and immune system strengthening of the child. Therefore,doctors advise mothers to breastfeed their infants.