Answer
The production of colostrum, the precursor to mature breast milk, typically begins in the second trimester of pregnancy (around weeks 13-28). Colostrum is a thick, yellowish fluid that is rich in antibodies and other beneficial substances for the newborn. However, it is generally not secreted in significant quantities until after the birth of the baby. The actual production of mature breast milk starts after delivery.
The exact time that breast milk production begins varies between women, but the body begins preparing for lactation during pregnancy. The body gradually increases the production of hormones that are necessary for successful breastfeeding.
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