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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.
An ultrasound showing a fetus measured to have a crown-rump length of 1.67 cm, and estimated to have a gestational age of 8 weeks and 1 day. Crown-rump length (CRL) is the measurement of the length of human embryos and fetuses from the top of the head (crown) to the bottom of the buttocks (rump).It is typically determined from ultrasound imagery and can be used to estimate gestational age.he length of the umbilical cord is approximately equal to the CRL throughout pregnancy. Gestational age is not the same as fertilization age. It takes about 14 days from the first day of the last menstrual period for conception to take place and thus for the conceptus to form.