Week 12 of pregnancy
12 Weeks Pregnant
First trimester
Baby size
About the size of a lime
5.4 cm
What's developing
Reflexes are developing — the baby may open and close fingers or curl toes. The face looks more human.
Common symptoms this week
- Reduced nausea
- Slight bump for some
- Dizziness
- Increased energy
This is an estimate for information only — only about 1 in 20 babies arrive on their due date. Always confirm dates with your midwife or doctor.
How big is a baby at 12 weeks?
Baby growth chart
Typical fetal length and weight from week 8 to week 40.
Length
cmWeek 12: 5.4 cm
Weight
gramsWeek 12: 14 g
Typical averages based on Hadlock / ACOG references. Weeks 8–20 use crown–rump length; weeks 21–40 switch to crown–heel — that's the small jump you'll see mid-chart. Real babies vary — your ultrasound is the reliable number for you.55
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