Feeding Your Baby / A baby’s body will develop and grow more in the first three years of his or her life than in all the years remaining. This emphasizes the fact that what a child ingests during these highly developmental years is of paramount importance. There will never be a question that breast-feeding is best for your baby: a mother’s milk is nature’s perfect and complete food for her baby. There are 400 nutrients known to be present in breast-milk that are unable to be replicated and not found in substitutes, such as powdered infant formula.