Baby size by week

How big is baby this week?

Baby grows from about the size of a poppy seed at week 4 to a watermelon at week 40. Find your week in the chart below: halfway, at week 20, baby is about the size of a banana.

This is the classic fruit and veggie chart from the original Bumpstagram album, the weekly bump photos Ryan took in 2013. It's a fun way to picture baby's growth, not a measurement. Your doctor or midwife has the real numbers.

First trimester: weeks 4 to 13

From a poppy seed to a peach. Most people find out they're pregnant around week 4 or 5, when baby is smaller than a sesame seed.

Baby size by week, first trimester

Week	Baby is about the size of
Week 4	A poppy seed
Week 5	A sesame seed
Week 6	A sweet pea
Week 7	A blueberry
Week 8	A raspberry
Week 9	A grape
Week 10	A prune
Week 11	A lime
Week 12	A passion fruit
Week 13	A peach

Second trimester: weeks 14 to 27

From a lemon to a rutabaga. This is when the bump starts to show, and a great time to start weekly bump photos if you haven't yet.

Baby size by week, second trimester

Week	Baby is about the size of
Week 14	A lemon
Week 15	An orange
Week 16	An avocadoIn the album: craving salty things, ice cream
Week 17	An onion
Week 18	A sweet potato
Week 19	A mango
Week 20	A bananaIn the album: craving lots of fruit, and still craving chocolate
Week 21	A pomegranateIn the album: craving chocolate covered pretzels and ice cream
Week 22	A papaya
Week 23	A grapefruit
Week 24	A cantaloupe
Week 25	A cauliflower
Week 26	A head of lettuceIn the album: craving carbs and sugar
Week 27	A rutabaga

Third trimester: weeks 28 to 40

From an eggplant to a watermelon. The bump grows fastest here, so these are the weeks you'll be gladdest you photographed.

Baby size by week, third trimester

Week	Baby is about the size of
Week 28	An eggplant
Week 29	An acorn squash
Week 30	A cucumber
Week 31	A pineapple
Week 32	A jicama
Week 33	A durian
Week 34	A butternut squashIn the album: craving water & fruit
Week 35	A coconut
Week 36	A honeydew
Week 37	A swiss chardIn the album: craving salads this week
Week 38	A pumpkinIn the album: craving eggs & fish
Week 39	A mini watermelon
Week 40	A watermelon

From the original album

Same window, same pose, every week, each photo paired with that week's fruit. A few of the real cards:

Want your own? Here's how to take weekly bump photos the same way.

Questions

How big is baby at 20 weeks?

At 20 weeks, baby is about the size of a banana on the classic fruit chart. It's the halfway point of a 40-week pregnancy.

How big is baby at 12 weeks?

At 12 weeks, baby is about the size of a passion fruit on the classic fruit chart, right at the end of the first trimester.

When is baby the size of a lemon?

Baby is about the size of a lemon at 14 weeks, the first week of the second trimester.

When is baby the size of a watermelon?

Baby reaches watermelon size at 40 weeks, full term. At 39 weeks the chart says mini watermelon.

Is the fruit size chart accurate?

It's a friendly guide, not a measurement. Every baby grows at their own pace, and different charts pick different fruits for the same week. For your baby's actual size, ask your doctor or midwife.

Can I see baby's size in the Bumpstagram app?

Yes. Each week, Bumpstagram puts baby's size next to your bump photo, along with how many days are left. You can pick the classic fruit chart or a different comparison set.