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When Does Milk Develop in Breasts?

In the days immediately following delivery, your newborn will get nourishment from colostrum, a thick, yellowish substance rich in protein and antibodies. Milk develops in the breasts approximately three to five days after delivery, according to Laurie MacLeod, certified nurse midwife in the department of OB-GYN at Ohio State University’s Wexner Medical Center. "Once you begin breastfeeding, your baby will stimulate the development of mature milk by actively sucking," says MacLeod. The more frequently you nurse your baby, the more milk your body will produce.

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