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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.
Babies gain about an ounce a day on average during this period, or half a pound per week, and they should be back to their birthweight by their second-week visit. Expect a growth surge around 3 weeks and then another one at 6 weeks. Boost Physical Development: 0-3 Months; Find the Best Baby Bottles; 3 Months to 6 Months