Many parents who think their babies are allergic to cow’s milk formulas ask me about switching to a partial hydrolysate formula like Good Start. Breastmilk is best, where possible, but the American Academy of Pediatrics (AAP) does have an excellent policy statement about hypoallergenic formulas.
A partial hydrolysate formula breaks down some of the milk proteins, but can still have 1,000 to 100,000 times more intact cow’s milk protein than a truly hydrolyzed, hypoallergenic formula such as Nutramigen. Good Start is not a good choice for a baby who is allergic to cow’s milk, although there is some evidence that it might help prevent some allergies in some kids who are at high risk of developing allergies.
Soy formulas can be a great alternative for many allergic kids, although some who are allergic to cow’s milk are also allergic to soy (8-14% according to the latest policy statement).
For most children on formula, a soy formula or a true hydrolyzed formula is the best choice to prevent or treat allergies.