🤰 Week by week

Pregnancy week by week

Pregnancy week by week — what your baby looks like, how big they are, what you might feel and what to focus on, from 4 to 41 weeks. NHS-aligned, answer-first.

First trimester

Weeks 4–12

4 weeks Size of a poppy seed → 5 weeks Size of a sesame seed → 6 weeks Size of a lentil → 7 weeks Size of a blueberry → 8 weeks Size of a raspberry → 9 weeks Size of a cherry → 10 weeks Size of a strawberry → 11 weeks Size of a lime → 12 weeks Size of a plum →

Second trimester

Weeks 13–26

13 weeks Size of a lemon → 14 weeks Size of a peach → 15 weeks Size of an orange → 16 weeks Size of an avocado → 17 weeks Size of a turnip → 18 weeks Size of a sweet potato → 19 weeks Size of a mango → 20 weeks Size of a banana → 21 weeks Size of a carrot → 22 weeks Size of a papaya → 23 weeks Size of a grapefruit → 24 weeks Size of an ear of corn → 25 weeks Size of a swede → 26 weeks Size of a red cabbage →

Third trimester

Weeks 27–41

27 weeks Size of a cauliflower → 28 weeks Size of an aubergine → 29 weeks Size of a butternut squash → 30 weeks Size of a cabbage → 31 weeks Size of a coconut → 32 weeks Size of a large jicama → 33 weeks Size of a pineapple → 34 weeks Size of a cantaloupe melon → 35 weeks Size of a honeydew melon → 36 weeks Size of a romaine lettuce → 37 weeks Size of a stick of chard → 38 weeks Size of a leek → 39 weeks Size of a mini watermelon → 40 weeks Size of a small pumpkin → 41 weeks Size of a watermelon → 42 weeks Size of a watermelon →

Size comparisons are approximate and just for fun; every baby grows at its own pace. This is general information, not medical advice — your midwife and the NHS week-by-week guide are your sources for personal antenatal care.