First trimester · 30 weeks to go
| Fact | Week 10 |
|---|---|
| Days of pregnancy | 64–70 since LMP |
| Gestational age span | 9w0d to 9w6d |
| Trimester | First trimester (weeks 1–13) |
| Pregnancy month | Month 1 (weeks 1–4) |
| Average length | 1.2 in (crown to rump) |
| Average weight | 0.14 oz |
| Size comparison | a prune |
| Weeks remaining | 30 (40-week due date) |
Week 10 ends the embryo chapter: your baby officially graduates to fetus. Vital organs are all in place and now must mature. Fingernails and downy hair follicles begin forming, and the stomach starts producing digestive juice.
The forehead bulges as the brain grows, wrists and elbows can bend, and toes are fully separated. Kicks are starting inside, though far too small to feel. The yolk sac shrinks as the placenta takes over nutrition.
Gestationally, week 10 means you are 9 weeks and 0 to 6 days pregnant, day 64 to day 70 counted from the first day of your last period. This is week 10 of the first trimester (weeks 1–13). Prenatal appointments run about every four weeks in this stretch. Week 12 brings the close of the nuchal translucency screening window (weeks 11–13). If your cycle runs longer or shorter than the 28 days the due-date math assumes, your ovulation date and due date shift with it, which is why a first-trimester ultrasound remains the gold standard for dating. Every number on this page is an average across pregnancies; your own scan dates and your baby's measurements are what actually describe your week 10.
Switch to a soft toothbrush if your gums bleed; pregnancy gingivitis is common and worth mentioning at the dentist.
Weeks of pregnancy don't map cleanly to calendar months, but the common division puts week 10 falls in month 1 of pregnancy (weeks 1–4). Week 10 is part of the first trimester, which runs from week 1 to week 13. Gestationally, week 10 means you are 9 weeks and 0 to 6 days pregnant.
At week 10 the baby averages 1.2 in long and weighs about 0.14 oz, roughly the size of a prune. Sizes come from fetal growth charts (crown-rump length before week 20), and normal variation week to week is wide; your ultrasound measurements always outrank a chart.