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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 is influenced by frequency of feeding. 1  Babies who are breastfed on cue and offered unrestricted feedings tend to grow faster. 2  Infants who sleep next to mother and who enjoy the luxury of unrestricted night nursing tend to grow faster.