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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.
By one month, most infants will gain about a pound over their birth weight. At this age, infants are not as sleepy, they begin developing a regular feeding pattern, and they have a stronger suck during feedings. On average, infants gain about one pound each month until they are 6 months old. Most babies double their birth weight by 5 months of age and triple their birth weight by the time they're 1 year old. The average weight of a 6-month-old is about 16 pounds (7.3 kg), and the average weight of a 1-year-old is approximately 21Â½ pounds (9.8 kg). Boys may be bigger than girls, and breastfed infants may weigh less than formula-fed infants.