2nd trimester · Week 20
20 weeks pregnant
Halfway, and the anatomy scan window
You are about halfway through a 40-week pregnancy. Fundal height is often near the navel. The detailed anatomy ultrasound is commonly offered around now.
How big is your baby at 20 weeks?
- Length
- 25.6 cm
- Weight
- 300 g
- Size
- Lemon
On average about 25.6 cm long and 300 g. Size comparison: Lemon.
These are averages; every baby grows at their own pace.
How is your baby developing at 20 weeks?
Measurements often switch from crown–rump to crown–heel (about 25–26 cm). Weight is often near 300 g. Hair, nails, and fingerprints are present. The fetus swallows and can hear muffled sounds.
What changes in your body at 20 weeks?
A clear bump is common, though body shape varies. Braxton Hicks tightenings may begin — usually painless and irregular. Back and pelvic pressure can increase.
Tips for this week
Use the anatomy scan to ask questions, not only to learn sex if you want that. Report painful regular tightenings, leaking fluid, or bleeding. If the placenta is reported low, many cases rise later — follow the plan you are given.
