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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.
After three to four days, the baby begins to regain weight and should attain or surpass her birth weight by 10 to 14 days. For the next three months, your infant grows at the astonishing rate of approximately an ounce a day. Between three and six months, her weight gain declines to four to five ounces a week.