For two to three days after you have your baby, your breasts will excrete colostrum, a yellowish fluid high in protein and protective antibodies. Although you may not think your baby is getting enough nourishment in the first two to three days, all she needs is the colostrum. A white, thinner milk will come in, generally 48 to 72 hours after delivery. The more frequently your baby feeds, the more milk you’ll make. Newborn babies generally need to nurse every one and a half to three hours. After several days, your body should be making exactly the right amount of milk to meet your baby’s needs.