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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.
To determine the approximate gestational age of a newborn, youâll assess six neuromuscular and six physical characteristics. This assessment, the New Ballard Score, is appropriate for newborns from 20 to 44 weeks of gestation, with the characteristics to assess varying with the stage of maturity.Each parameter scores from minus 2 to 5, with the cumulative score correlating with a gestational age between 26 and 44 weeks.Timing of the gestational assessment influences the accuracy of its results. For newborns younger than 26 gestational weeks, perform the assessment sooner than 12 hours after birth.ach parameter scores from minus 2 to 5, with the cumulative score correlating with a gestational age between 26 and 44 weeks. Timing of the gestational assessment influences the accuracy of its results. For newborns younger than 26 gestational weeks, perform the assessment sooner than 12 hours after birth.