Engorgement initially happens 2-6 days after birth and is your milk coming in. Engorgement is when a mother's breast size and fullness increases as her hormone levels change and her milk production increases. It is important to note, that mothers do have milk in the first days after birth. Colostrum is what the baby gets in the first three days, is rich in nutrients and very dense. Only a small amount is needed until mother's milk increases and the baby requires more. Engorg