Average Fetal Weight Chart

From eight to approximately 20 weeks, your baby will be measured from crown to rump as below: Pregnancy week Length (inches) Weight (ounces) Length (cm) Mass (g) 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 Then from approximately 20 weeks, your baby will be measured from 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