At what stage of pregnancy do women start to form milk in their breasts?

Colostrum is the first "milk" a baby gets from his mothers breasts. This is a thicker substance and after babies birth that is all he needs for the first couple days. After that, mother's milk comes in. Colostrum is the first "milk" a baby gets from his mothers breasts. This is a thicker substance and after babies birth that is all he needs for the first couple days. After that, mother's milk comes in. Colostrum is the first "milk" a baby gets from his mothers breasts. This is a thicker substance and after babies birth that is all he needs for the first couple days. After that, mother's milk comes in.