Your child's size and growth

Lots of parents wonder whether their child is bigger or smaller than other kids the same age.

To give you a benchmark, here are the values from the 25th percentile to the 75th percentile for weight and height – meaning that half of kids fall within these ranges. A quarter of kids fall above these numbers and a quarter of kids below them.

At each well-child visit, the doctor will weigh and measure your child and tell you his height and weight percentiles. (You can also compute them yourself, using our Growth Percentile Calculator.) Talk with the doctor if you have any concerns about your child's growth.

Baby

Birth

	Boys	Girls
Weight	6.7 - 8.1 pounds	6.5 - 7.8 pounds
Length	19.1 - 20.1 inches	18.9 - 19.8 inches

3 months

	Boys	Girls
Weight	13.0 - 15.2 pounds	11.8 - 14.0 pounds
Length	23.6 - 24.7 inches	23.0 - 24.1 inches

Quick tip: For babies born prematurely, use gestational age (not age since birth) when you look up their numbers in this chart.

6 months

	Boys	Girls
Weight	16.2 - 18.8 pounds	14.8 - 17.5 pounds
Length	26.1 - 27.2 inches	25.3 - 26.5 inches

Fast fact: By age 6 months, most babies have doubled their birth weight.

9 months

	Boys	Girls
Weight	18.2 - 21.1 pounds	16.7 - 19.7 pounds
Length	27.7 - 28.9 inches	27.0 - 28.3 inches

Toddler

12 months

	Boys	Girls
Weight	19.8 - 22.9 pounds	18.2 - 21.4 pounds
Height	29.2 - 30.5 inches	28.5 - 29.8 inches

15 months

	Boys	Girls
Weight	21.1 - 24.5 pounds	19.5 - 23.0 pounds
Height	30.5 - 31.8 inches	29.9 - 31.2 inches

18 months

	Boys	Girls
Weight	22.4 - 26.0 pounds	20.8 - 24.5 pounds
Height	31.7 - 33.1 inches	31.0 - 32.5 inches

21 months

	Boys	Girls
Weight	23.6 - 27.5 pounds	22.0 - 26.0 pounds
Height	32.7 - 34.3 inches	32.1 - 33.8 inches

Preschooler

24 months

	Boys	Girls
Weight	24.8 - 28.9 pounds	23.3 - 27.5 pounds
Height	33.8 - 35.4 inches	33.2 - 34.9 inches

27 months

	Boys	Girls
Weight	27.0 - 31.2 pounds	25.8 - 30.0 pounds
Height	34.1 - 36.1 inches	33.7 - 35.6 inches

30 months

	Boys	Girls
Weight	27.8 - 32.2 pounds	26.7 - 31.1 pounds
Height	35.0 - 37.0 inches	34.6 - 36.6 inches

33 months

	Boys	Girls
Weight	28.6 - 33.2 pounds	27.6 - 32.3 pounds
Height	35.8 - 37.8 inches	35.4 - 37.4 inches

36 months

	Boys	Girls
Weight	29.5 - 34.3 pounds	28.4 - 33.4 pounds
Height	36.5 - 38.6 inches	36.0 - 38.1 inches

4 years

	Boys	Girls
Weight	33.3 - 39.1 pounds	32.2 - 38.5 pounds
Height	39.2 - 41.5 inches	38.6 - 41.0 inches

Big Kid

5 years

	Boys	Girls
Weight	37.5 - 44.7 pounds	36.3 - 44.0 pounds
Height	41.7 - 44.2 inches	41.3 - 43.8 inches

6 years

	Boys	Girls
Weight	41.9 - 50.6 pounds	40.8 - 50.0 pounds
Height	44.2 - 46.9 inches	43.9 - 46.7 inches

7 years

	Boys	Girls
Weight	46.5 - 56.8 pounds	45.6 - 56.6 pounds
Height	46.6 - 49.5 inches	46.5 - 49.4 inches

8 years

	Boys	Girls
Weight	51.5 - 63.6 pounds	50.9 - 64.3 pounds
Height	48.9 - 52.0 inches	48.8 - 51.9 inches