"Every year medical journal articles describe more valuable substances discovered in human milk. Scientists are only beginning to write the story on other factors in human milk that may be important to baby's growth and development. For example, other enzymes besides lipase are available to aid infant digestion. Epidermal growth factor, present in human milk in significant amounts, may promote the development of tissues in the digestive tract and elsewhere. Other hormones in milk may influence a baby's metabolism, growth, and physiology. The effects may be subtle, but they may also have far-reaching implications. Being breastfed has advantages that reach into adulthood. Science is only beginning to learn what these benefits are."