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Pregnancy week by week

40 weeks, one week at a time

Each week your baby grows a little and your body changes too. Pick your week to see how your baby is doing and what to get ready.

Weeks 1–13

First trimester

  1. Week 1
  2. Week 2
  3. Week 3
  4. Week 4About the size of a sesame seed
  5. Week 5About the size of a peppercorn
  6. Week 6About the size of a mung bean
  7. Week 7About the size of a corn kernel
  8. Week 8About the size of a peanut
  9. Week 9About the size of a grape
  10. Week 10About the size of a kumquat
  11. Week 11About the size of a strawberry
  12. Week 12About the size of a lime
  13. Week 13About the size of a passion fruit

Weeks 14–27

Second trimester

  1. Week 14About the size of a mandarin
  2. Week 15About the size of an apple
  3. Week 16About the size of an avocado
  4. Week 17About the size of a pear
  5. Week 18About the size of a bell pepper
  6. Week 19About the size of a mango
  7. Week 20About the size of a banana
  8. Week 21About the size of a carrot
  9. Week 22About the size of an ear of corn
  10. Week 23About the size of a young pomelo
  11. Week 24About the size of a small papaya
  12. Week 25About the size of a cauliflower
  13. Week 26About the size of a large dragon fruit
  14. Week 27About the size of a small butternut squash

Weeks 28–40

Third trimester

  1. Week 28About the size of a small coconut
  2. Week 29About the size of a pomelo
  3. Week 30About the size of a cabbage
  4. Week 31About the size of a pineapple
  5. Week 32About the size of a small pumpkin
  6. Week 33About the size of a small durian
  7. Week 34About the size of a cantaloupe
  8. Week 35About the size of a small watermelon
  9. Week 36About the size of a large papaya
  10. Week 37About the size of a winter melon
  11. Week 38About the size of a young jackfruit
  12. Week 39About the size of a watermelon
  13. Week 40About the size of a large pumpkin