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Atopic dermatitis is increasing in incidence and is often influenced by infant diet. Some studies suggest that breast milk and hydrolyzed cow's milk–based formula reduce risk for atopic dermatitis in infants. However, previous systematic reviews have combined data for formulas that differ in protein source and method and extent of hydrolysis. To compare the incidence of atopic dermatitis among infants fed partially hydrolyzed 100% whey protein formula (PHF-W) and those fed regular cow's milk–based formula, researchers conducted a meta-analysis of 18 studies (representing 12 study populations and involving about 1000 infants). In all studies but one, infants were considered at high risk for allergy (defined as having a family history of atop…