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Forty weeks, drawn at true size.

Every week has its own page and its own painted flower — with the real measurement beside it, what is developing, and a line worth writing down.

Written from the NHS week-by-week guides and a published fetal-development table, and linked to them on every page. Not reviewed by a clinician — the editorial policy says exactly what that means.

First trimester

Weeks 1–13. From before conception to the end of the third month — the quietest, least visible, and often hardest stretch to hold on to.

Read the first trimester

Second trimester

Weeks 14–27. The middle months, when the pregnancy usually starts to feel like something you can picture rather than only something you are told.

Read the second trimester

Third trimester

Weeks 28–40. The last stretch — bigger, slower, closer, and the part people most often say they wish they had written down.

Read the third trimester
  1. A seed, held — the week 1 flowerWeek 1A seed, heldno size yet
  2. The seed in soil — the week 2 flowerWeek 2The seed in soilno size yet
  3. First root, unseen — the week 3 flowerWeek 3First root, unseenno size yet
  4. Baby's-breath floret — the week 4 flowerWeek 4Baby's-breath floretno size yet
  5. Lilac floret — the week 5 flowerWeek 5Lilac floret0.2 cm
  6. Forget-me-not — the week 6 flowerWeek 6Forget-me-not0.5 cm
  7. Lily-of-the-valley bell — the week 7 flowerWeek 7Lily-of-the-valley bell1 cm
  8. Violet — the week 8 flowerWeek 8Violet1.6 cm
  9. Chamomile bloom — the week 9 flowerWeek 9Chamomile bloom2.3 cm
  10. Cherry blossom — the week 10 flowerWeek 10Cherry blossom3.1 cm
  11. Crocus — the week 11 flowerWeek 11Crocus4.1 cm
  12. Daffodil — the week 12 flowerWeek 12Daffodil5.4 cm
  13. Tulip bloom — the week 13 flowerWeek 13Tulip bloom6.7 cm
  14. Magnolia bloom — the week 14 flowerWeek 14Magnolia bloom8.7 cm
  15. Pansy — the week 15 flowerWeek 15Pansy10.1 cm
  16. Gerbera daisy — the week 16 flowerWeek 16Gerbera daisy11.6 cm
  17. Bearded iris — the week 17 flowerWeek 17Bearded iris13 cm
  18. Water lily — the week 18 flowerWeek 18Water lily14.2 cm
  19. Hibiscus — the week 19 flowerWeek 19Hibiscus15.3 cm
  20. Sweet pea, full stem — the week 20 flowerWeek 20Sweet pea, full stem25.6 cm
  21. Anemone — the week 21 flowerWeek 21Anemone27.4 cm
  22. Morning glory — the week 22 flowerWeek 22Morning glory29 cm
  23. Freesia — the week 23 flowerWeek 23Freesia30.6 cm
  24. Marigold — the week 24 flowerWeek 24Marigold32.2 cm
  25. Begonia — the week 25 flowerWeek 25Begonia33.7 cm
  26. Lavender sprig — the week 26 flowerWeek 26Lavender sprig35.1 cm
  27. Calla lily — the week 27 flowerWeek 27Calla lily36.6 cm
  28. Iceland poppy — the week 28 flowerWeek 28Iceland poppy37.6 cm
  29. Cosmos — the week 29 flowerWeek 29Cosmos39.2 cm
  30. Zinnia — the week 30 flowerWeek 30Zinnia40.5 cm
  31. Black-eyed Susan — the week 31 flowerWeek 31Black-eyed Susan41.8 cm
  32. Aster — the week 32 flowerWeek 32Aster43 cm
  33. Hydrangea stem — the week 33 flowerWeek 33Hydrangea stem43.7 cm
  34. Snapdragon — the week 34 flowerWeek 34Snapdragon45 cm
  35. Dahlia, full stem — the week 35 flowerWeek 35Dahlia, full stem46.2 cm
  36. Peony, full stem — the week 36 flowerWeek 36Peony, full stem47.4 cm
  37. Orchid spike — the week 37 flowerWeek 37Orchid spike48.6 cm
  38. Stargazer lily stem — the week 38 flowerWeek 38Stargazer lily stem49.2 cm
  39. Sunflower, cut stem — the week 39 flowerWeek 39Sunflower, cut stem50.1 cm
  40. Long-stemmed rose — the week 40 flowerWeek 40Long-stemmed rose51.2 cm