12 Weeks Pregnant
Welcome to week 12 of pregnancy. Your baby is now about the size of a lime — roughly 5.4 cm from crown to rump and around 14 grams. Below: what is developing, what you may be feeling, and the appointments that belong to this week.
Baby at 12 weeks
| Size comparison | About the size of a lime |
|---|---|
| Crown-to-rump length | ~5.4 cm |
| Weight | ~14 g |
| Trimester | Trimester 1 of 3 · about 2.8 months |
What's developing
- All major organs have formed; the rest of pregnancy is growth and refinement.
- Reflexes begin — the fetus can open and close fingers and curl toes.
- The kidneys start producing urine, which becomes part of the amniotic fluid.
You at 12 weeks
- Many people find first-trimester nausea begins to ease around 12–14 weeks.
- Energy often rebounds in the second trimester.
- Your uterus is rising out of the pelvis, which may ease bladder pressure.
This week's checklist
- The nuchal translucency screening window is 11w0d–13w6d — book now if offered.
- Dating ultrasound before 14 weeks gives the most accurate due date.
- Discuss genetic screening options with your provider.
Frequently asked questions
How many months is 12 weeks?
About 2.8 months — use the weeks-to-months converter for the full breakdown.
Is my due date still accurate at this stage?
If your dating came from a first-trimester scan, IVF dates, or tracked ovulation, yes. If your due date rests on a remembered period alone, the multi-anchor due date calculator can show how much other anchors would move it.