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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.
On average a breastfed baby will double their birth weight by the time they are six months old. At 12 months, a breastfed baby will weigh about 2.5 times their birth weight. Exclusively breastfed babies tend to double their birth weight by five months.