Colostrum, which is rich in protein, micronutrients, and antibodies, is replaced by mature milk in about colostrum, which is rich in protein, micronutrients, and antibodies, is replaced by mature milk in about 4 to 6 days. 1 to 2 days. 2 to 4 days. 6 to 9 days.

Colostrum is replaced by transitional milk in about 2 to 4 days after birth. This milk contains high levels of lactose, fat, vitamins and more calories than the colostrum. Mature milk replaces the transitional milk and begins to appear near the end of the second week after childbirth. Mature milk contains more water than transitional milk.