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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.
Normal weight loss is temporary. About 95 percent of bottle-fed babies will regain their birth weight by 14.5 days, and 95 percent of breastfed babies by 18.7 days, according to a study in the November 2003 issue of Archives of Diseases in Children Fetal & Neonatal Edition..