Hyperbilirubinemia in breast-versus formula-fed infants in the first six weeks of life: relationship to weight gain.

Bilirubin determinations were obtained at weekly intervals from 1 to 6 weeks of age in 27 breast-fed and 12 formula-fed term, average size infants. Mean bilirubin levels were significantly higher in breast-fed infants at each age studied. The highest mean bilirubin level in each group was present at 1 week of age, 10.