Formula-fed infants also have higher incidences of colic, constipation, and allergic disorders. In fact, a significant number of babies are allergic to formulas, both those based on cow milk and those based on soy. There is also new evidence that artificially fed infants more often experience learning disorders and lower levels of intellectual functioning. Bottle feeding with formula more commonly leads to overfeeding and obesity, which may well persist into childhood, adolescence, and adulthood. Some studies suggest the benefits of breastfeeding also extend into adulthood.
Breastfed babies have lower cholesterol levels, on average, when they become adults.
Although asthma rates are not significantly different between breastfed and non-breastfed babies, there is a lower rate of asthma in adults who were breastfed. Babies have a smaller chance of developing diabetes and cancer of the lymph glands if they are breastfed. For all of these reasons, the American Academy of Pediatrics recommends that infants be offered only breast milk for the first four to six months after birth, and that breastfeeding continue throughout the entire first year. Establishing a close bond and meeting the emotional needs of a child are certainly an essential part of mothering. The nursing woman is thought to produce hormones that promote a physiologic bonding between mother and child.