Growth Chart

From early in pregnancy, babies grow at different rates, so these numbers are merely averages. Your baby's actual length and weight may vary substantially. 

VIDEO

Inside pregnancy: Early fetal development

 

A 3D animated look at development of the embryo, which quickly develops from a single cell to several million cells all working together.

Don't worry too much if an ultrasoundindicates that your baby is much smaller or larger. (Your practitioner will let you know if it's time to worry about how big your baby is.) By full-term, your baby may end up weighing less than 5 pounds or more than 9.

Until about 20 weeks, babies are measured from the crown (or top) of the head to the rump (or bottom). This is because a baby's legs are curled up against his torso during the first half of pregnancy and very hard to measure.

After that, babies are measured from head to toe.

See our pregnancy timing article to learn how the weeks of pregnancy are counted and your baby's gestational age is determined.

Gestational age	Length(US)	Weight(US)	Length(cm)	Mass(g)
	(crown to rump)		(crown to rump)
8 weeks	0.63 inch	0.04 ounce	1.6 cm	1 gram
9 weeks	0.90 inch	0.07 ounce	2.3 cm	2 grams
10 weeks	1.22 inch	0.14 ounce	3.1 cm	4 grams
11 weeks	1.61 inch	0.25 ounce	4.1 cm	7 grams
12 weeks	2.13 inches	0.49 ounce	5.4 cm	14 grams
13 weeks	2.91 inches	0.81 ounce	7.4 cm	23 grams
14 weeks	3.42 inches	1.52 ounce	8.7 cm	43 grams
15 weeks	3.98 inches	2.47 ounces	10.1 cm	70 grams
16 weeks	4.57 inches	3.53 ounces	11.6 cm	100 grams
17 weeks	5.12 inches	4.94 ounces	13 cm	140 grams
18 weeks	5.59 inches	6.70 ounces	14.2 cm	190 grams
19 weeks	6.02 inches	8.47 ounces	15.3 cm	240 grams
20 weeks	6.46 inches	10.58 ounces	16.4 cm	300 grams
	(crown to heel)		(crown to heel)
20 weeks	10.08 inches	10.58 ounces	25.6 cm	300 grams
21 weeks	10.51 inches	12.70 ounces	26.7 cm	360 grams
22 weeks	10.94 inches	15.17 ounces	27.8 cm	430 grams
23 weeks	11.38 inches	1.10 pound	28.9 cm	501 grams
24 weeks	11.81 inches	1.32 pound	30 cm	600 grams
25 weeks	13.62 inches	1.46 pound	34.6 cm	660 grams
26 weeks	14.02 inches	1.68 pound	35.6 cm	760 grams
27 weeks	14.41 inches	1.93 pound	36.6 cm	875 grams
28 weeks	14.80 inches	2.22 pounds	37.6 cm	1005 grams
29 weeks	15.2 inches	2.54 pounds	38.6 cm	1153 grams
30 weeks	15.71 inches	2.91 pounds	39.9 cm	1319 grams
31 weeks	16.18 inches	3.31 pounds	41.1 cm	1502 grams
32 weeks	16.69 inches	3.75 pounds	42.4 cm	1702 grams
33 weeks	17.20 inches	4.23 pounds	43.7 cm	1918 grams
34 weeks	17.72 inches	4.73 pounds	45 cm	2146 grams
35 weeks	18.19 inches	5.25 pounds	46.2 cm	2383 grams
36 weeks	18.66 inches	5.78 pounds	47.4 cm	2622 grams
37 weeks	19.13 inches	6.30 pounds	48.6 cm	2859 grams
38 weeks	19.61 inches	6.80 pounds	49.8 cm	3083 grams
39 weeks	19.96 inches	7.25 pounds	50.7 cm	3288 grams
40 weeks	20.16 inches	7.63 pounds	51.2 cm	3462 grams
41 weeks	20.35 inches	7.93 pounds	51.7 cm	3597 grams
42 weeks	20.28 inches	8.12 pounds	51.5 cm	3685 grams

Where to go next:

Find out how your child will grow from birth to age 8.

Sources:

Doublet PM, Benson CB, Nadel AS, et al: "Improved birth weight table for neonates developed from gestations dated by early ultrasonography." Journal of Ultrasound Medicine. 16:241, 1997.

Hadlock FP, Shah YP, Kanon DJ, et al. "Fetal crown rump length: Reevaluation of relation to menstrual age with high resolution real-time US Radiology." 182:501, 1992.

Usher R, McLean F. "Intrauterine growth of live-born Caucasian infants at sea level: Standards obtained from measurements in 7 dimensions of infants born between 25 and 44 weeks of gestation." Pediatrics. v.74, 1969.