| 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 (2.15 kg) | 45 cm | 2146 grams |
| 35 weeks | 18.19 inches | 5.25 pounds (2.38 kg) | 46.2 cm | 2383 grams |
| 36 weeks | 18.66 inches | 5.78 pounds (2.62 kg) | 47.4 cm | 2622 grams |
| 37 weeks | 19.13 inches | 6.30 pounds (2.86 kg) | 48.6 cm | 2859 grams |
| 38 weeks | 19.61 inches | 6.80 pounds (3.08 kg) | 49.8 cm | 3083 grams |
| 39 weeks | 19.96 inches | 7.25 pounds (3.29 kg) | 50.7 cm | 3288 grams |
| 40 weeks | 20.16 inches | 7.63 pounds (3.46 kg) | 51.2 cm | 3462 grams |
| 41 weeks | 20.35 inches | 7.93 pounds (3.60 kg) | 51.7 cm | 3597 grams |
| 42 weeks | 20.28 inches | 8.12 pounds (3.68 kg) | 51.5 cm | 3685 grams |
Monday, June 6, 2011
Average fetal length and weight chart
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