Medicine is fraught with controversies. However, there is one topic upon which there is almost universal agreement: with few exceptions, breast milk is the best source of nourishment for infants. Breast milk is an impressive food. The milk produced during pregnancy and just after birth is rich in the nutrients and antibodies newborns need. By three to five days after birth, the milk is an easy-to-digest balance of the right amount of fat, sugar, water and protein to help the baby continue to grow.