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Most newborns will gain about 5-7 oz a week for the first few months. Many babies will have doubled their birth weight by about 3-4 months. At 4 months, weight gain will begin to look different for breastfed and formula fed babies. Research clearly shows that breastfed babies and formula fed babies grow at different rates starting at about 4 months of age.
Breast-fed babies average a weight gain of 6 oz. a week during the first four months, 4 to 5 oz. a week between 4 and 6 months old, and 2 to 4 oz. a week between 6 and 12 months old. The baby should also seem satisfied after nursing, be active and alert and meet her developmental milestones.