Lipid concentrations vary the most among the nutritional components of milk, being higher early in the day and more generally, early in the life of the child. Low levels of EFA's in soy-based formulas has been implicated in development delay. Carbohydrates Lactose is the predominant sugar in milk. It is a disaccharide of glucose and galactose. Glucose is a primary direct source of energy, while galactose can be used for both energy and in many biosynthetic pathways.
Vitamins Are completely adequate to cover the needs of the infant.
No supplements are required. A general principle is that the infant's immune system is immature at birth and is much less able to ward off infection than adults are. Newborns receive some protection in utero through transfer of antibodies across the placenta, but this protection tapers off quickly after birth. Breast milk contains a number of components to help protect the infant from pathogens. Secretory IgA IgA is one of five classes of antibodies produced by the immune system.