Once mom’s milk supply is ‘in,’ expected infant weight gain in the first 3 months is approximately 30 grams a day. The infant’s weights should be plotted on a World Health Organization growth curve to ensure proper interval growth¹. Healthy breastfeeding infants often reach birthweight before 2 weeks. Infants who are not gaining appropriately need evaluation by a lactation specialist to determine if the problem is lack of milk transfer at the breast, maternal low milk supply, or an infant health problem. The caloric value of breastmilk is NOT a factor in situations of insufficient weight gain.