Excessive Weight Loss in Breastfed Infants During the Postpartum Hospitalization

In the absence of other indicators of ineffective breastfeeding, breastfeeding infants who lose ≥7% of their birth weight during the first 2 days postpartum might be experiencing a physiologic diuresis after birth, unrelated to their breastfeeding behaviors. More research is necessary to determine the cause of a ≥7% weight loss in newborns during the first 48 hours after birth.