Your baby can hear your heartbeat and voice. An ultrasound scan at 18-20 weeks can check that your baby is growing normally, as well as the position of your placenta.
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$$FIRSTNAME$$, you at 20 weeks pregnant
Your baby can hear your heartbeat and voice. An ultrasound scan at 18-20 weeks can check that your baby is growing normally, as well as the position of your placenta.
How big is my baby this week? Your baby is about as long as a toothbrush – about 16 cm from head to bottom. Baby weighs about 320 gm.

See week 19 | See week 21

Your baby

Your baby is busy and active:

  • Your baby is covered in vernix – a white, creamy substance that protects baby’s skin from the amniotic fluid.
  • The heart is beating at 120-160 beats per minute.
  • Muscles are growing, and your baby is moving around a lot.
  • Your baby’s fingerprints are formed.
  • Permanent teeth have grown beneath your baby’s first teeth, deep in the gums.
  • Your baby can hear sounds, such as your heart or voice, even though the ears aren’t yet completely formed


You’re at the halfway point of the average pregnancy now.

You might feel a bit breathless at times, especially when you’re lying flat on your back. This is because your uterus is taking up a lot more room, and some of your other organs – for example, your heart and lungs – have less space.

Aching hips? When you’re lying down at night, you could try putting a pillow on one or both sides, or even between your legs. Many women find this helps ease the ache.

Your 18-20 week ultrasound scan

You can have an ultrasound scan at 18-20 weeks of pregnancy to check that your baby is growing normally and to check the position of your placenta.

This detailed ultrasound is one of the routine tests in pregnancy. It looks at your baby’s body parts and can usually pick up any obvious problems in development or growth, like spina bifida, heart defects and limb defects.

You’ll probably see your baby’s heart beating, the curve of baby’s spine, baby’s face, and baby’s arms waving and legs kicking.

If you want to find out the sex of your baby, this is the time to ask.

If you or your baby has a medical problem – for example, diabetes or high blood pressure – you’re considered to have a high-risk pregnancy. This means you’re likely to need to see your health professionals more often and have more checks during pregnancy.

A new grandchild

New grandchildren can often make family relationships stronger and closer, but not always.

The relationship between grandparents and grandchildren can have a very positive influence on children’s development. Many grandparents are amazed and delighted at the joy, fun and love that becoming ‘nan’ or ‘pop’ can bring to their lives.

Birth Choices
Our Birth Choices guide makes decisions about pregnancy and birth care easy. Birth Choices lets you compare birth at public hospital, private hospital, birth centre and home. For each setting, you can see the carers who will look after you. And you can see your pregnancy progress week by week.
My Neighbourhood
Becoming a parent opens up a whole new world, right in your own neighbourhood. Use the interactive maps in our My Neighbourhood tool to find services, support, activities and events in your local area. My Neighbourhood can help you connect with other new parents like yourself.

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