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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.
2 â 4 ounces per week. [click here to see tables in Metric Units]â  It is acceptable for some babies to gain 4-5 ounces per week.â¡ The average breastfed baby doubles birth weight by 3-4 months. World Health Organization Child Growth Standards, 2006. Available at: http://www.who.int/childgrowth/en/.