These types of formulas, which are called protein hydrolysate formulas, have protein that's been broken down partially or extensively into tinier proteins than the ones in cow's milk and soy-based formulas. "Because these proteins are not intact there's no allergic response," says Aliza Solomon, D.O., a pediatric gastroenterologist at New York-Presbyterian Hospital/Weill Cornell Medical Center in New York City.
Enfamil Gentlease and Similac Sensitive are partially hydrolyzed, which means the milk proteins in these formulas have been partially broken down. Similac Alimentum and Enfamil Nutramigen both have extensively broken down proteins for babies with the greatest sensitivity to cow's milk and soy.
Hypoallergenic formulas will help at least 90 percent of babies who have allergies to cow's milk and soy, which can cause symptoms such as hives, a runny nose, and intestinal problems, according to the American Academy of Pediatrics.
These formulas are more expensive than conventional formulas. They can smell or taste different from the conventional formulas, so some babies don't like them, says Dr. Shu. But neither issue should deter you from giving your baby hypoallergenic formula. "If she can't tolerate the other formula she's not getting any nutrition at all, and she's probably in a lot of pain."
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