Risk of Diarrhea Related to Iron Content of Infant Formula: Lack of Evidence to Support the Use of Low-iron Formula as a Supplement for Breastfed Infants

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Abstract
Background. Concern has been raised by infant feeding experts that supplementing breastfed infants with iron-fortified formula rather than low-iron formula may have an undesirable impact on their gastrointestinal flora. Thus far, there have been no clinical studies to address this issue directly. We compared the reported frequency of diarrhea for breastfed infants given iron-fortified formula with those fed low-iron formula.