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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.
Formula-fed babies tend to gain weight faster than breastfed babies, according to authors of The Babycenter Essential Guide to your Baby's First Year.. This difference in weight gain is especially evident during months four to six. A breastfed baby may gain 1 pound less than a formula-fed baby during the first year.