Baby Size by Week
Poppy seed today, small pumpkin by the end, pick a week and see how your little one measures up (approximately, adorably).
From poppy seed to small pumpkin, pick a week and see roughly how big your baby is. Fun approximations, because every baby grows differently.
Not sure what week you’re in? Find out here.
Week 20
About the size of a banana
Halfway! (Measured head-to-heel from now on.)
- Approximate length
- 25.6 cm
- head to heel
- Approximate weight
- 300 g
Fun approximations, every baby grows differently, and your provider’s measurements are the ones that matter.
Every week at a glance
| Week | About the size of | Length | Weight |
|---|---|---|---|
| 4 | a poppy seed | 0.1 cm | – |
| 5 | a sesame seed | 0.2 cm | – |
| 6 | a lentil | 0.5 cm | – |
| 7 | a blueberry | 1 cm | – |
| 8 | a raspberry | 1.6 cm | 1 g |
| 9 | a cherry | 2.3 cm | 2 g |
| 10 | a strawberry | 3.1 cm | 4 g |
| 11 | a fig | 4.1 cm | 7 g |
| 12 | a lime | 5.4 cm | 14 g |
| 13 | a peapod | 7.4 cm | 23 g |
| 14 | a lemon | 8.7 cm | 43 g |
| 15 | an apple | 10.1 cm | 70 g |
| 16 | an avocado | 11.6 cm | 100 g |
| 17 | a pear | 13 cm | 140 g |
| 18 | a bell pepper | 14.2 cm | 190 g |
| 19 | an heirloom tomato | 15.3 cm | 240 g |
| 20 | a banana | 25.6 cm | 300 g |
| 21 | a carrot | 26.7 cm | 360 g |
| 22 | a spaghetti squash | 27.8 cm | 430 g |
| 23 | a large mango | 28.9 cm | 500 g |
| 24 | an ear of corn | 30 cm | 600 g |
| 25 | a rutabaga | 34.6 cm | 660 g |
| 26 | a head of lettuce | 35.6 cm | 760 g |
| 27 | a cauliflower | 36.6 cm | 875 g |
| 28 | a large eggplant | 37.6 cm | 1005 g |
| 29 | a butternut squash | 38.6 cm | 1150 g |
| 30 | a cabbage | 39.9 cm | 1320 g |
| 31 | a coconut | 41.1 cm | 1500 g |
| 32 | a jicama | 42.4 cm | 1700 g |
| 33 | a pineapple | 43.7 cm | 1920 g |
| 34 | a cantaloupe | 45 cm | 2150 g |
| 35 | a honeydew melon | 46.2 cm | 2380 g |
| 36 | a head of romaine | 47.4 cm | 2620 g |
| 37 | a bunch of Swiss chard | 48.6 cm | 2860 g |
| 38 | a leek | 49.8 cm | 3080 g |
| 39 | a mini watermelon | 50.7 cm | 3290 g |
| 40 | a small pumpkin | 51.2 cm | 3460 g |
How this works
Comparisons run from week 4 (poppy seed) to week 40 (small pumpkin). Through about week 19, length is measured crown to rump; from week 20 on, head to heel, which is why the numbers jump around then. Around weeks 26–32, baby has filled out enough for wonderfully detailed 3D/HD photos.
Sources & method
Lengths and weights are rounded midpoints of commonly published averages, crown-to-rump through about week 19, head-to-heel from week 20 on. They are bonding-and-fun approximations, not growth standards; only your prenatal provider’s measurements assess your baby’s growth.
Want to see for yourself?
Around weeks 26–32, baby's face has filled out beautifully, the perfect moment for a 3D/HD bonding session in Woburn, MA.
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