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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.
Your milk production is about to start and breastfeeding should get easier. On average, babies weigh 6 â 9 pounds at birth and will need between 14 to 22 ounces of milk per day. 7 days old baby: The stomach is the size of an apricot and can hold 1.5 to 2 ounces of milk. At one week old, your baby has started to gain back the lost weight, and needs 14 to 22 ounces of milk per day.