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Pregnancy Guide·Second Trimester

Week 20: Halfway Point

Banana (~25cm head to toe)·Last reviewed: 25 April 2026
Quick answer

Week 20 is the halfway point of pregnancy. Your baby is about 25cm long and weighs around 300g. According to Nuhah's pregnancy guide, the anatomy scan typically happens this week, checking your baby's development in detail.

Baby development at week 20

This is the halfway point. Your baby is about 25cm from head to toe and weighs around 300g - about the size of a banana. The anomaly scan window opens. Baby swallows amniotic fluid regularly and produces meconium (the first bowel movement, stored until after birth). Taste buds are functional - the baby can taste what you eat through the amniotic fluid. Movement is strong and regular.

Your body this week

Your uterus is now at the level of your navel. You are likely feeling regular movements. The anomaly scan typically happens this week or next. You may notice stretch marks beginning to appear as your skin stretches. Leg cramps, especially at night, are common. Your appetite is probably strong, and weight gain typically accelerates from here.

Things to do this week

1
Attend your 20-week anomaly scan - this detailed ultrasound checks your baby's organs and development
2
You may be able to find out the sex at this scan if you wish
3
Start thinking about antenatal classes if you haven't booked yet
4
This is a good time to start a regular gentle exercise routine
5
Begin researching nursery essentials - check Nuhah's milestone-mapped essentials guide

Frequently asked questions

What does the 20-week anomaly scan check?

The anomaly scan is a detailed ultrasound that checks the baby's brain, face, spine, heart, stomach, kidneys, limbs, and placenta position. It takes about 30 minutes. Most scans show everything is developing well. If something needs further investigation, you will be told at the appointment.

How big is my baby at 20 weeks?

About 25cm from head to toe and weighing around 300g, roughly the size of a banana. This is the halfway point of pregnancy. Your baby has working taste buds, is swallowing amniotic fluid, and is moving regularly.

Can I find out the sex at the 20-week scan?

Many hospitals will tell you the sex at the anomaly scan if you ask, though some hospitals have a policy of not revealing it. If you want to know, mention this at the start of the scan. The sonographer will try to get a clear view but cannot always guarantee accuracy.

Is it normal to not feel movement at 20 weeks?

Yes, especially for first-time parents. Movement typically becomes noticeable between weeks 18-22 for first pregnancies. It can be easy to miss early movements. If you have not felt anything by week 24, mention it to your midwife.

Related reading

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Pregnancy Mental Health: It's OK to Not Be OK
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Pregnancy Vitamins: What You Need and When
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Pregnancy Exercise: What's Safe and What to Avoid

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