Breast milk is composed of hundreds of distinct bioactive molecules, some of which are not yet fully understood by scientists. Although infant formula also provides complete nutrition, it doesn't fully replicate the immune benefits of breast milk. Nonetheless, infant formula is a safe and acceptable alternative to breast milk.

It contains the proper proportion of nutrients that your baby needs, including protein, carbohydrates, fat, and calcium. It provides natural antibodies that help your baby resist illnesses, such as ear infections. It's usually more easily digested than formula. So breastfed babies are often less constipated and gassy.