Rippey PLF, et al. - In view of global health agencies supporting the idea of not feeding infants with complementary foods before 4 to 6 months of age, researchers here sought to determine the impact on the infant health of the timing of the introduction of nonformula complimentary food between breastfed and formula-fed infants. “Anything other than breast milk” defined complementary food as per WHO. Using logistic regression with generalized estimating equations on the newborn through 6-month waves of the Infant Feeding Practices Study II, they predicted eight health outcomes by complementary food introduction, breast-feeding, formula feeding, and mixed feeding (breastfed and formula-fed). Results support exclusive breastfeeding is beneficial for the health of infants. A bigger risk to infant health was observed in correlation with the initiation of complementary foods before 4 to 6 months vs formula. Given that early complementary food introduction as more prevalent among formula-fed infants, most health discrepancies between breastfeeding groups shift to nonsignificance in full models, with the exception that formula-fed and mixed-fed infants exhibit higher rates of hard stool and cough/wheeze but mixed-fed exhibit lower rates of diarrhea and runny nose or cold than breastfed infants.