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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.
Breastfed baby weight gain (growth patterns) 1  Weight gain of 4-7 ounces (112-200 grams) a week during the first month. 2  An average of 1-2 pounds (1/2 to 1 kilogram) per month for the first six months. 3  An average of one pound (1/2 kilogram) per month from six months to one year.