Cow's milk is very high in saturated fat, which human babies have trouble digesting, and low in monounsaturates, the main fats in human milk. So the first step is to remove all the fat. The resulting skim milk is heated, then dehydrated if it's going to be in powdered form. Then new fats, in the form of vegetable oil blends, are added along with proteins, milk sugar (lactose) and a long list of nutrients, vitamins and minerals that are required by federal regulation to approximate their levels in breast milk.
Cow's milk has three times as much protein as breast milk. Calves need this because they grow so quickly, but for human babies it would put too much of a load on the liver and kidneys. Cow's milk also has a higher proportion of casein than breast milk does. Formula manufacturers must reduce the overall amount of protein to mimic the protein balance found in breast milk. Formula contains bovine (cow) immunoglobulins which are programmed to recognize micro-organisms that cause disease in cattle rather than humans; they work in the bloodstream rather than the gut.
Breastfeeding .
Both you and your baby can benefit from breastfeeding. It enhances the emotional bond between the child and the mother. .
Babies: Before a baby is born he/she is protected within the mothers" womb from all infections and after birth, breastfeeding takes over the protection process. Babies receive the greatest benefits of all from breastfeeding. Breastfed babies have lesser tendency to develop heart diseases, diabetes, asthma, and other allergic disorders later in life. It has been observed over time that breastfeeding helps in visual and brain development. The aforementioned components of breast milk are responsible for the majority of these advantages. .
Most importantly is Colostrum, the first milk produced in the early days of breastfeeding. This milk is low in fat, and high in carbohydrates, protein, and antibodies to help keep your baby healthy.