I've posted this on another thread so sorry for the reptition.
Infant Formula:
Second Best but Good Enough
by Isadora B. Stehlin
A century ago, babies who couldn't be breast-fed usually didn't survive. Today, although breast-feeding is still the best nourishment for infants, infant formula is a close enough second that babies not only survive but thrive.
Commercially prepared formulas are regulated by the Food and Drug Administration.
The safety of commercially prepared formula is also ensured by the agency's nutrient requirements (see "Nutrient Requirements") and by strict quality control procedures that require manufacturers to analyze each batch of formula for required nutrients, to test samples for stability during the shelf life of the product, to code containers to identify the batch, and to make all records available to FDA investigators.
The composition of infant formula is similar to breast milk, but it isn't a perfect match, because the exact chemical makeup of breast milk is still unknown.
Human milk is very complex, and scientists are still trying to unravel and understand what makes it such a good source of nutrition for rapidly growing and developing infants. However, John C. Wallingford, Ph.D., an infant nutrition specialist with FDA's Center for Food Safety and Applied Nutrition, notes that "infant formula is increasingly close to breast milk."
More than half the calories in breast milk come from fat, and the same is true for today's infant formulas. This may be alarming to many American adults watching their intake of fat and cholesterol, especially when sources of saturated fats, such as coconut oil, are used in formulas. (In adults, high intakes of saturated fats tend to increase blood cholesterol levels more than other fats or oils.) But the low-fat diet recommended for adults doesn't apply to infants.
"Infants have a very high energy requirement, and they have a restricted volume of food that they can digest," says Wallingford. "The only way to get the energy density of a food up is to have a high amount of fat."
While greater knowledge about human milk has helped scientists improve infant formula, it has become "increasingly apparent that infant formula can never duplicate human milk," write John D. Benson, Ph.D, and Mark L. Masor, Ph.D., in the March 1994 issue of Endocrine Regulations. "Human milk contains living cells, hormones, active enzymes, immunoglobulins and compounds with unique structures that cannot be replicated in infant formula."
Benson and Masor, both of whom are pediatric nutrition researchers at infant formula manufacturer Abbott Laboratories, believe creating formula that duplicates human milk is impossible. "A better goal is to match the performance of the breastfed infant," they write. Performance is measured by the infant's growth, absorption of nutrients, gastrointestinal tolerance, and reactions in blood.