What does the 20-week anomaly scan check?

The 20-week anomaly scan is a detailed check of your baby's physical development. Your sonographer will look at the brain, heart, spine, kidneys, abdomen, face, and limbs. It also checks the position of the placenta and the amount of amniotic fluid.

Can I find out my baby's gender at the 20-week NHS scan?

Not all NHS trusts reveal the sex of the baby. If you would like to find out earlier or with certainty, a private gender reveal scan at MyBaby Ultrasound in Camberley, Surrey can be booked from 16 weeks of pregnancy.

Your 20-Week Scan: What to Expect at Your Anatomy Ultrasound

Apr 30

2 min read

The 20-week scan — also called the anatomy scan or mid-pregnancy scan — is one of the most eagerly anticipated moments of your entire pregnancy journey. It is usually offered between 18 and 22 weeks and gives you and your healthcare team a detailed look at how your baby is growing and developing.

20-week anatomy ultrasound scan image of baby in the womb

What Is the 20-Week Scan?

The 20-week scan is a detailed ultrasound examination that checks your baby's anatomy from head to toe. Unlike earlier scans which focus on dating the pregnancy, this scan is a thorough structural survey of your baby's development. Your baby is roughly the size of a banana — around 25–30 cm — and the scan typically lasts between 30 and 45 minutes.

What Does the Sonographer Check?

The brain, skull, and facial features (eyes, nose, lips)
The heart — checking all four chambers and major vessels
The spine, checking for neural tube development
The abdomen, stomach, kidneys, and bladder
The arms, legs, hands, and feet
The placenta position, umbilical cord, and amniotic fluid levels

Can You Find Out the Sex at the 20-Week Scan?

Yes! If your baby is in a cooperative position, your sonographer may be able to tell you whether you are having a boy or a girl. Sex determination at this stage is not always 100% accurate — it depends on the baby’s position, image quality, and your sonographer’s view on the day. For a dedicated gender reveal scan with a greater chance of a clear view, a private scan is a wonderful option.

How Should I Prepare?

Drink water beforehand — a full bladder improves image quality
Wear loose, comfortable clothing
Bring your partner or a loved one to share the moment
Write down any questions for your sonographer in advance

Book Your 20-Week Scan at MyBaby Ultrasound

At MyBaby Ultrasound in Camberley, we provide a warm, relaxed environment for expectant parents. Our experienced sonographers take the time to explain every part of the scan and answer your questions. Ready to book? Get in touch today.