Baby size week by week
| Week | About the size of | Length | Weight | Trimester |
|---|---|---|---|---|
| Week 4 | A poppy seed | 0.1–0.2 cm | — | First |
| Week 5 | A sesame seed | 0.2–0.3 cm | — | First |
| Week 6 | A lentil | 0.4–0.6 cm | — | First |
| Week 7 | A blueberry | 0.8–1.0 cm | — | First |
| Week 8 | A kidney bean | 1.6 cm | 1 g (0 oz) | First |
| Week 9 | A grape | 2.3 cm | 2 g (0.1 oz) | First |
| Week 10 | A kumquat | 3.1 cm | 4 g (0.1 oz) | First |
| Week 11 | A fig | 4.1 cm | 7 g (0.2 oz) | First |
| Week 12 | A lime | 5.4 cm | 14 g (0.5 oz) | First |
| Week 13 | A pea pod | 7.4 cm | 23 g (0.8 oz) | First |
| Week 14 | A lemon | 14.7 cm | 93 g (3.3 oz) | Second |
| Week 15 | An apple | 16.7 cm | 117 g (4.1 oz) | Second |
| Week 16 | An avocado | 18.6 cm | 146 g (5.2 oz) | Second |
| Week 17 | A pomegranate | 20.4 cm | 181 g (6.4 oz) | Second |
| Week 18 | A bell pepper | 22.2 cm | 223 g (7.9 oz) | Second |
| Week 19 | A mango | 24 cm | 273 g (9.6 oz) | Second |
| Week 20 | A banana | 25.6 cm | 331 g (11.7 oz) | Second |
| Week 21 | A carrot | 26.7 cm | 399 g (14.1 oz) | Second |
| Week 22 | A papaya | 27.8 cm | 478 g (16.9 oz) | Second |
| Week 23 | A grapefruit | 28.9 cm | 568 g (20 oz) | Second |
| Week 24 | A corn cob | 30 cm | 670 g (23.6 oz) | Second |
| Week 25 | A cauliflower | 34.6 cm | 785 g (27.7 oz) | Second |
| Week 26 | A lettuce | 35.6 cm | 913 g (32.2 oz) | Second |
| Week 27 | A cabbage | 36.6 cm | 1.06 kg (2.3 lb) | Second |
| Week 28 | An aubergine | 37.6 cm | 1.21 kg (2.7 lb) | Third |
| Week 29 | A butternut squash | 38.6 cm | 1.38 kg (3 lb) | Third |
| Week 30 | A cucumber bunch | 39.9 cm | 1.56 kg (3.4 lb) | Third |
| Week 31 | A coconut | 41.1 cm | 1.75 kg (3.9 lb) | Third |
| Week 32 | A jicama | 42.4 cm | 1.95 kg (4.3 lb) | Third |
| Week 33 | A pineapple | 43.7 cm | 2.16 kg (4.8 lb) | Third |
| Week 34 | A cantaloupe | 45 cm | 2.38 kg (5.2 lb) | Third |
| Week 35 | A honeydew melon | 46.2 cm | 2.6 kg (5.7 lb) | Third |
| Week 36 | A romaine lettuce | 47.4 cm | 2.81 kg (6.2 lb) | Third |
| Week 37 | A bunch of chard | 48.6 cm | 3.03 kg (6.7 lb) | Third |
| Week 38 | A leek | 49.8 cm | 3.24 kg (7.1 lb) | Third |
| Week 39 | A mini watermelon | 50.7 cm | 3.44 kg (7.6 lb) | Third |
| Week 40 | A small pumpkin | 51.2 cm | 3.62 kg (8 lb) | Third |
| Week 41 | A small pumpkin | 51.5 cm | 3.75 kg (8.3 lb) | Third |
| Week 42 | A small pumpkin | 51.7 cm | 3.85 kg (8.5 lb) | Third |
Lengths are crown-to-rump up to 13 weeks and crown-to-heel after; weights are the 50th percentile (Hadlock) from 10 weeks. Every baby grows at its own pace.