Mother and Baby

20 Weeks Pregnant: Advice, symptoms and how big is your baby at twenty weeks?

Your baby at 20 weeks pregnant

This week you’ll be getting ready for your next scan, and your baby’s bones are getting stronger. Find out more about what your baby and body is doing and the common symptoms to look out for at 20 weeks pregnant.

How big is my baby at 20 weeks?

Your baby is now about six and a half inches, or about the size of a small cantaloupe melon if we keep up with the fruit analogies!

What’s my baby doing at 20 weeks?

This week, if you want to, you’ll be able to find out whether your little melon-sized baby is a boy or a girl! If you’re carrying a mini-me, she’ll already have seven million primitive eggs in her ovaries, this will be down to two million when she’s born. If you’re carrying a boy, his testicles will start moving from his abdomen this week.

At 20 weeks, your baby’s growth spurt means her arms and legs have lengthened in the last few weeks and she’s starting to look more and more like a baby every day! Her internal organs, such as her lungs, digestive system and immune system are all growing and developing and her bones are getting stronger.

What is my body doing at 20 weeks?

Up until this point in your pregnancy, your placenta has weighed more than your baby, but from this point onwards, your baby will overtake it in weight. However, the placenta is still going to carry on growing, and will have trebled in size by the end of your pregnancy.

Whilst we’re talking about the placenta, it will be something your sonographer checks during your scan this week. A placenta positioned close to or covering your cervix and the opening to the womb, known as placenta praevia, can cause difficulties when it comes to giving birth. Luckily, as your uterus grows, it can pull the placenta up and away from the cervix, so even if you have a low-lying placenta now, it could sort itself out by the time you give birth, so don’t panic! 

Now you are pretty much at the halfway point, you’ll be feeling your baby more and people will probably be noticing your baby bump. You might also notice your hair and nails are growing faster than normal – this is one of the benefits of those pregnancy hormones.

5 common symptoms to look out for:


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1) Heartburn and indigestion

Yep, it’s still very much a problem, and unfortunately, it’s set to stay as your bump gets bigger. Try eating smaller meals, not lying down after meals and chewing sugarless gum after mealtimes to alleviate the symptoms.
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2) Headaches

Another normal side effect of pregnancy, be sure to take regular breaks to get fresh air and talk to your GP if they are too persistent.
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3) ​Leg Cramps

 We’re still not sure why this happens during pregnancy, but if those shooting pains are waking you in the night, try and put your feet up more during the day and make sure you’re drinking plenty of water.
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4) Edema

If your feet and ankles look like you’ve just got off a long-haul flight, you’re suffering with edema – basically water retention in your ankles and feet. Don’t do a Victoria Beckham – ditch those heels and make sure your shoes are comfy and not too tight. Also, if you can avoid wearing tight socks or tights as these can cut off the blood flow and make the swelling worse.
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5) Your belly button changes

You knew it was going to happen, but in the next few weeks your innie is probably going to become an outie as your uterus pushes your abdomen forward. Don’t worry – it will go back to normal after you give birth.

Everything you need to know about your 20-week scan

Now for the exciting part, 20 weeks means it’s time to see your baby on ultrasound again at your anomaly scan. Your little one will be much more developed than at the last scan, and if you want, you can ask your sonographer to tell you if it’s a boy or a girl. This decision is completely up to you, and is one worth thinking carefully about.

The anomaly scan also checks your baby’s heartbeat, the structure of her abdomen, the head, the spine, the brain and the volume of amniotic fluid. The sonographer will also take detailed measurements of your baby’s bones, to ensure everything is as expected.

Once the scan is complete, you can usually take a printout home with you. Find more information about the scan and what’s happening here. 

 What to do this week:

  • Make sure you’re getting enough calcium: If your baby were to have an X-ray, her skeleton would show up more clearly because more calcium has been deposited within her bones. Help her along by including plenty of calcium-rich foods in your diet! 

Take me back to week 19

Take me to week 21

Read next, our 2017 Mother & Baby award winning car seats:


ADVANSAFIX III SICT, Britax Römer, £475, Amazon

A high-quality car seat from a brand you can trust, this car seat will last your little one until they are 12-years-old. Our panel of mum testers loved the design, the Isofix fitting and the washable covers, but found it slightly annoying having to remove the seat to alter the height.
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Every Stage FX, Joie, £250, Amazon

When it comes to great value for money, Joie have it covered with their Every Stage FX car seat – lasting from birth to 36kg. Light enough to transfer easily between cars and quick to adjust, making this clever car seat a great option if you want to easily alter one car seat for two children. 
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EVOLVA 1-2-3 SL SICT, Britax Römer, £164, Amazon

A brilliant car seat from a brand you can trust, this clever car seat comes with a number of clever extras, such as auto-tension seat belts, a reclining seat and in-built cup holders. Suitable from nine-months to 12-years, with Isofix for peace of mind, rest assured your tot is safe in this high-quality car seat.  
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Skippa Fix, Cosatto, £169.95, Amazon

A bright seat that will grab your little one’s attention and will last from 4-12. Our mums loved the design, how lightweight and easy the car seat was what to fit and how much their tots seemed to like sitting in it. The only downside our mums could find is the cup holder, which isn’t useable if you have other car seats or passengers in the back.
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Viaggio 2-3 Flex, Peg Perego, £177.60, Amazon

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BABY-SAFE-i-SIZE, Britax Römer, £265, UberKids

Our panel of mum testers loved how safe and comfortable the Britax Romer looked on the go – from the soft padded seat, to the Isofix base, this was a stand-out car seat. We love that the Britax comes with a newborn insert and an adjustable head rest, allowing it to grow with your baby.
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Pebble Plus & 2wayFix Base, Maxi-Cosi, £150, Amazon

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REBL™ plus, Nuna, £325, Mothercare

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Spin 360, Joie, £250, Amazon

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Stages Isofix, Joie, £300, Amazon

The Joie Stages car seat is one that constantly tops our awards list – it’s durable and comfortable, lightweight enough to swap between cars and gives you peace of mind your tot is safe. That said, it’s not the smallest car seat, and recline positions need to be selected before you get the seat in the car.
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