It doesn't provide enough iron to maintain proper blood cell counts or proper hemoglobin. In addition, studies have shown that school children who had good iron status as infants because they were fed iron-fortified formula performed better on standardized developmental tests than children with poor iron status. Also there was some concern about too much iron interfering with the immune system. All of those concerns and questions have been laid to rest with appropriate studies. However, it is now understood that an infant absorbs virtually 100 percent of the iron from human milk, but considerably less from infant formula.
Researchers continue to try to determine the best amount of iron for infant formula.
While low-iron formulas don't supply enough iron, the best amount of iron for formulas has not been established. The study is also reviewing the level of all other nutrients in infant formula, as well as the need for nutrients not currently included. The choice should depend on whatever the parents find convenient and can afford. Whatever form is chosen, proper preparation and refrigeration are essential. Once the powder is mixed with water, it should also be refrigerated if it is not used right away.