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Most babies weigh between 5 1/2 and 10 pounds. The average length of a newborn is 20 inches (50 centimeters), with a range of 18 to 22 inches. The average head circumference (the distance around the head) is 14 inches (35 centimeters).At each visit, your doctor charts your child's growth.f you have an average-size baby, you can expect her to double her birth weight by five months of age, triple it by one year, and quadruple it by two years. The average gain in length or height is 10 to 12 inches in the first year and 5 inches in the second year.
Normal Head Circumference. For the first six months of your baby's life, his head will measure approximately 2 centimeters bigger than his chest. From age 6 to 24 months, his head and chest will have about the same circumference. After two years, the baby's head will measure smaller than his chest.One measurement outside of the range of normal does not necessarily indicate a problem.o determine that your baby's growth is within the normal range, your physician will compare his height, weight and head circumference to other children using growth charts. These charts allow physicians to identify low growth quickly and seek appropriate solutions.