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Birth to 1 month: The average newborn gains 2/3 to 1 ounce a day and grows 1 to 1 1/2 inches in length over the course of the whole month.
Infants gain about 20 g per day (0.67 oz per day) between 3 and 6 months of age and approximately 10 g per day between 6 and 12 months. Infants double their birth weight by 4 months of age and triple their birth weight by age 1. Children typically gain 4 to 6 pounds per year between age 2 and puberty. During puberty the childhood growth rate doubles, but because some kids start developing as early as age 8 and some not until age 14.