40 weeks of wonder

Pregnancy, week by week

Follow your baby’s growth from a tiny poppy seed to a fully-grown newborn. Each week has its own page with baby size, what’s developing, common symptoms and a friendly tip.

Not sure where you are? Find your week with the due date calculator →

First trimester

Weeks 1–13

From a positive test to those first scans — big changes are happening, even when you don’t look pregnant yet.

Week 1 a fresh start The countdown begins Week 2 an egg, ripening Getting ready to conceive Week 3 a cluster of cells Conception Week 4 a poppy seed Implantation Week 5 a sesame seed A positive test Week 6 a sweet pea A flickering heartbeat Week 7 a blueberry Growing fast Week 8 a raspberry Tiny movements Week 9 a cherry From embryo to fetus Week 10 a kumquat Officially a fetus Week 11 a fig Hiccups and kicks Week 12 a lime Reflexes switch on Week 13 a pea pod Last week of trimester one

Second trimester

Weeks 14–27

Often the most comfortable stretch: energy returns, the bump shows, and you may feel those first kicks.

Week 14 a lemon Hello, second trimester Week 15 an apple Sensing light Week 16 an avocado First flutters Week 17 a pomegranate Building fat stores Week 18 a bell pepper Ready for a close-up Week 19 a mango A protective coating Week 20 a banana Halfway there Week 21 a carrot Tasting the menu Week 22 a spaghetti squash A real little person Week 23 a large mango Hearing your voice Week 24 an ear of corn A key milestone Week 25 a cauliflower Filling out Week 26 a head of lettuce Eyes open Week 27 a head of cauliflower Last week of trimester two

Third trimester

Weeks 28–40

The home stretch — your baby gains weight fast as you both get ready for the big day.

Week 28 an eggplant Welcome to trimester three Week 29 a butternut squash Stronger every day Week 30 a large cabbage Three quarters there Week 31 a coconut Running out of room Week 32 a jicama Getting into position Week 33 a pineapple Bones and brains Week 34 a cantaloupe Almost ready lungs Week 35 a honeydew melon Snuggling in Week 36 a head of romaine lettuce Dropping down Week 37 a bunch of Swiss chard Early term Week 38 a leek Any day now Week 39 a mini watermelon Full term Week 40 a small pumpkin Meeting your baby