I get a lot of requests for a general idea of how big the fetus is inside the uterus.
I found this chart 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 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 |
| 43 weeks | 20.20 inches | 8.19 pounds | 51.3 cm | 3717 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.
