Weeks 1–13
First trimester
From before conception to the end of the third month — the quietest, least visible, and often hardest stretch to hold on to.
These 13 weeks begin before there is anything to measure and end at about 6.7 cm (2.6 in) — a tulip bloom.
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Week by week
- Week 1A seed, heldNo size claim
- Week 2The seed in soilNo size claim
- Week 3First root, unseenNo size claim
- Week 4Baby's-breath floretNo size claim
- Week 5Lilac floret0.2 cm (0.1 in)
- Week 6Forget-me-not0.5 cm (0.2 in)
- Week 7Lily-of-the-valley bell1 cm (0.4 in)
- Week 8Violet1.6 cm (0.6 in)
- Week 9Chamomile bloom2.3 cm (0.9 in)
- Week 10Cherry blossom3.1 cm (1.2 in)
- Week 11Crocus4.1 cm (1.6 in)
- Week 12Daffodil5.4 cm (2.1 in)
- Week 13Tulip bloom6.7 cm (2.6 in)