Your baby is constantly growing. This chart should be used to give you a general idea of how big your baby is at different stages during your pregnancy. You will be given a more accurate measurement when you go for your 12 and 20 week scans.
Your midwife will measure your fundal height (basically the size of your bump, from your pubic bone to the top of your uterus) to make sure your baby’s growth is on track.
| PREGNANCY / WEEK | BABY’S LENGTH / CM | BABY’S WEIGHT / G | BABY’S LENGTH / IN | BABY’S WEIGHT / OZ |
| Week 4 | 0.036 – 0.10 cm | – | up to 0.04 in | < 0.04 oz |
| Week 5 | 0.13 cm | – | 0.05 n | < 0.04 oz |
| Week 6 | 0.32 cm | – | 0.13 in | < 0.04 oz |
| Week 7 | 1.27 cm | – | 0.5 in | < 0.04 oz |
| From 8 – 19 weeks your babys measurement is from crown to rump | ||||
| Week 8 | 1.60 cm | 1 g | 0.63 in | 0.04 oz |
| Week 9 | 2.30 cm | 2 g | 1.22 in | 0.07 oz |
| Week 10 | 3.10 cm | 4 g | 1.22 in | 0.14 oz |
| Week 11 | 4.10 cm | 7 g | 1.61 in | 0.25 oz |
| Week 12 | 5.40 cm | 14 g | 2.13 in | 0.49 oz |
| Week 13 | 7.40 cm | 23 g | 2.91 in | 0.81 oz |
| Week 14 | 8.70 cm | 43 g | 3.42 in | 1.52 oz |
| Week 15 | 10.10 cm | 70 g | 3.98 in | 2.47 oz |
| Week 16 | 11.16 cm | 100 g | 4.57 in | 3.53 oz |
| Week 17 | 13.00 cm | 140 g | 5.12 in | 4.94 oz |
| Week 18 | 14.20 cm | 190 g | 5.59 in | 6.70 oz |
| Week 19 | 15.30 cm | 240 g | 6.02 in | 8.47 oz |
| From 20 weeks your babys measurement is from crown to heal | ||||
| Week 20 | 25.60 cm | 300 g | 10.08 in | 10.58 oz |
| Week 21 | 26.70 cm | 360 g | 10.51 in | 12.70 oz |
| Week 22 | 27.80 cm | 430 g | 10.94 in | 15.17 oz |
| Week 23 | 28.90 cm | 501 g | 11.38 in | 1.10 lb |
| Week 24 | 30.00 cm | 600 g | 11.81 in | 1.32 lb |
| Week 25 | 34.60 cm | 660 g | 13.62 in | 1.46 lb |
| Week 26 | 35.60 cm | 760 g | 14.02 in | 1.68 lb |
| Week 27 | 36.60 cm | 875 g | 14.41 in | 1.93 lb |
| Week 28 | 37.60 cm | 1005 g | 14.80 in | 2.22 lb |
| Week 29 | 38.60 cm | 1153 g | 15.20 in | 2.54 lb |
| Week 30 | 39.90 cm | 1319 g | 15.71 in | 2.91 lb |
| Week 31 | 41.10 cm | 1502 g | 16.18 in | 3.31 lb |
| Week 32 | 42.40 cm | 1702 g | 16.69 in | 3.75 lb |
| Week 33 | 43.70 cm | 1918 g | 17.20 in | 4.23 lb |
| Week 34 | 45.00 cm | 2146 g | 17.72 in | 4.73 lb |
| Week 35 | 46.20 cm | 2383 g | 18.19 in | 5.25 lb |
| Week 36 | 47.40 cm | 2622 g | 18.66 in | 5.78 lb |
| Week 37 | 48.60 cm | 2859 g | 19.13 in | 6.30 lb |
| Week 38 | 49.80 cm | 3083 g | 19.61 in | 6.80 lb |
| Week 39 | 50.70 cm | 3288 g | 19.96 in | 7.25 lb |
| Week 40 | 51.20 cm | 3462 g | 20.16 in | 7.63 lb |
