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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.
Weight Gain Patterns. Between 1 to 4 months of age, an infant will generally gain 1 1/2 to 2 pounds per month, explains HealthyChildren.org, the website published by the American Academy of Pediatrics. From 4 to 7 months, his weight gain will slow to 1 to 1 1/2 pounds each month. A healthy baby boy will weigh between 14 1â2 and 17 1â2 pounds at 8 months; infant girls normally weigh about half a pound less than infant boys. By 12 months of age, a baby weighs about three times more than she did at birth.