Week-by-week guide
Baby size by week, from 4 to 40
From a tiny poppy seed to a full-term baby — see how your little one grows each week, with development facts written by a registered midwife.
🎚️ Try the interactive slider tool →First Trimester
Second Trimester
Third Trimester
🥦
Week 27
Broccoli
14.4 in
🍆
Week 28
Eggplant
14.8 in
🎃
Week 29
Butternut squash
15.2 in
🥬
Week 30
Cabbage
15.7 in
🥥
Week 31
Coconut
16.2 in
🧅
Week 32
Jicama
16.7 in
🍍
Week 33
Pineapple
17.2 in
🍈
Week 34
Cantaloupe
17.7 in
🍈
Week 35
Honeydew
18.2 in
🥗
Week 36
Head of lettuce
18.7 in
🌿
Week 37
Swiss chard bunch
19.1 in
🧅
Week 38
Leek
19.6 in
🍉
Week 39
Watermelon
20.0 in
🎃
Week 40
Pumpkin
20.2 in
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