How Big Is That Baby In Your Belly??

by in Average fetal length and weight chart, Fetal Development, Growing Baby, pregnancy


I get a lot of requests for a general idea of how big the fetus is inside the uterus. I found this chart at babycenter.com and wanted to post it for all of those curious mommies to be.

Gestational Age
Length(US)
Weight (US)
Length(cm)
Weight(cm)
(crown to rump)(crown to rump)
8 weeks0.63 inch0.04 ounce1.6 cm1 gram
9 weeks0.90 inch0.07 ounce2.3 cm2 grams
10 weeks1.22 inch0.14 ounce3.1 cm4 grams
11 weeks1.61 inch0.25 ounce4.1 cm7 grams
12 weeks2.13 inches0.49 ounce5.4 cm14 grams
13 weeks2.91 inches0.81 ounce7.4 cm23 grams
14 weeks3.42 inches1.52 ounce8.7 cm43 grams
15 weeks3.98 inches2.47 ounces10.1 cm70 grams
16 weeks4.57 inches3.53 ounces11.6 cm100 grams
17 weeks5.12 inches4.94 ounces13 cm140 grams
18 weeks5.59 inches6.70 ounces14.2 cm190 grams
19 weeks6.02 inches8.47 ounces15.3 cm240 grams
20 weeks6.46 inches10.58 ounces16.4 cm300 grams
(crown to heel)(crown to heel)
20 weeks10.08 inches10.58 ounces25.6 cm300 grams
21 weeks10.51 inches12.70 ounces26.7 cm360 grams
22 weeks10.94 inches15.17 ounces27.8 cm430 grams
23 weeks11.38 inches1.10 pound28.9 cm501 grams
24 weeks11.81 inches1.32 pound30 cm600 grams
25 weeks13.62 inches1.46 pound34.6 cm660 grams
26 weeks14.02 inches1.68 pound35.6 cm760 grams
27 weeks14.41 inches1.93 pound36.6 cm875 grams
28 weeks14.80 inches2.22 pounds37.6 cm1005 grams
29 weeks15.2 inches2.54 pounds38.6 cm1153 grams
30 weeks15.71 inches2.91 pounds39.9 cm1319 grams
31 weeks16.18 inches3.31 pounds41.1 cm1502 grams
32 weeks16.69 inches3.75 pounds42.4 cm1702 grams
33 weeks17.20 inches4.23 pounds43.7 cm1918 grams
34 weeks17.72 inches4.73 pounds45 cm2146 grams
35 weeks18.19 inches5.25 pounds46.2 cm2383 grams
36 weeks18.66 inches5.78 pounds47.4 cm2622 grams
37 weeks19.13 inches6.30 pounds48.6 cm2859 grams
38 weeks19.61 inches6.80 pounds49.8 cm3083 grams
39 weeks19.96 inches7.25 pounds50.7 cm3288 grams
40 weeks20.16 inches7.63 pounds51.2 cm3462 grams
41 weeks20.35 inches7.93 pounds51.7 cm3597 grams
42 weeks20.28 inches8.12 pounds51.5 cm3685 grams
43 weeks20.20 inches8.19 pounds51.3 cm3717 grams

This is an average of the baby’s size. If your baby is bigger or smaller, please don’t be alarmed. Contact your physician if you are concerned about any issues you are having with your pregnancy.




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About the Author

SAHM of 2 boys and founder of GrowingYourBaby.com, World Traveled Family and The World We Share. When I'm not running around after my boys, I'm looking for our next vacation spot!

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