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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 babies gain weight quickly during the first few weeks, but then slow down considerably and are leaner overall compared to formula-fed babies. During the first month, a breastfed baby grows approximately four to seven oz., 112 to 200 g, per week, or approximately one-half to one oz. per day. From months two to six, babies gain an average of one to two lbs. per month, and from six months to one year, the average weight gain is one lb. per month. From the time they are born until their first birthday, babies grow by approximately nine inches -- one inch per month for the first six months and a half inch for each month after.