Pregnancy calendar

weeks pregnant

18 weeks pregnant - all you need to know

Your baby measures about 14cm this week - roughly the same as a bell pepper!

Week 18 infographic.

What does my baby look like in week 18?

When your baby is born, you may hear about using white noise to help them sleep. The reason this is such a great trick is because they're used to noise - the womb is far from silent. At 18 weeks they can hear sounds all around them and might even respond to music or a loud noise.

Your pregnancy symptoms in week 18

When does my bump start to show?

Your waist will start to disappear as your womb moves up out of your pelvis and your bump is becoming more noticeable.

If you've been pregnant before, this may happen a bit sooner than for first-time mums.

Back pain and pregnancy

Your bump is growing and hormones are making your muscles and ligaments relax, which is not a good combination for your back.

If you suffer from backache these tips should help:

  • Avoid heavy lifting if possible.
  • You may find that a firm mattress or a massage helps.
  • Exercising in water, having a pregnancy massage or back care classes may help ease the pain.
  • If it’s very painful, ask your doctor or midwife to refer you to a physiotherapist.

Get our free guide to 10 common pregnancy complaints (and how to avoid them) straight to your inbox.

Feeling baby move

You might feel the odd movement as your baby practises kicking, and flexing his tiny limbs. It can be wonderfully reassuring to feel your baby wriggle about inside you but don't expect to feel it much at this stage.

Lots of women don't feel movement for a couple of weeks yet, especially in a first pregnancy. You may not even be sure if it's the baby at first - it can just feel like a fluttering in your stomach.

Read more about baby's movements.

What to do in week 18

How can I find antenatal classes near me?

Antenatal classes are a great way to prepare for the birth of your baby. And they’re sometimes a good way to meet other expectant families in your area.

Ask your midwife, health visitor or GP about NHS classes locally.

If my partner smokes is my baby at risk?

The risks of secondhand smoke are significant. Secondhand smoke is highly toxic, despite the fact that 80% of it is invisible and doesn’t smell.

No matter how careful your partner thinks they are being about keeping smoke away from you, you and your baby still get the harmful poisons. Opening windows and doors or smoking in another room will not make it safe.

If a smoker in your household quits smoking, the benefits to you and your baby are huge, similar to when you stop yourself.

Find out more about the effects of smoking in pregnancy.

Your next scan

You’ll have your second scan, known as the ‘fetal anomaly scan' between 18 and 21 weeks. The reason for this scan is to check the physical development of your baby.

The sonographer might also be able to tell the sex of your baby at this scan. If you'd prefer not to know whether you're having a boy or a girl, let them know so they don't accidentally tell you the gender!

“I didn’t find out what we were expecting in my first pregnancy. In some ways waiting was excruciating but it was so exciting not knowing. We found out with our second, but I think I preferred the element of surprise the first time!” Lucy, mum of two.

Read more about pregnancy ultrasound scans.

Pregnancy clothing

You might want to start adding some maternity clothes to your wardrobe if you haven't already done so. Trousers or skirts that are elasticated or loose around your tummy will be the most comfortable.

You don't need to spend a lot on maternity clothes as you won't need them for long. Lots of high street shops have affordable maternity ranges and you can also save money by:

  • borrowing clothes from friends who have recently had babies
  • looking on local forums or online auction sites
  • browsing second-hand shops.


  1. Lennart Nilsson (2009) A Child is Born, Jonathan Cape
  2. NHS Choices (2013). You and your pregnancy at 17-20 weeks pregnant. on 08.05.2015
  3. Backache in pregnancy, NHS Choices: (Page last reviewed: 31/03/2017 Next review due: 31/03/2020).
  4. NHS Smokefree [accessed 28/04/2015] Secondhand smoke,
  5. Royal College of Obstetricians and Gynaecologists, Reduced fetal movements, Green-top guideline 57, London RCOG, 2011 
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    Last reviewed on June 26th, 2018. Next review date June 26th, 2021.

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    Please note that these comments are monitored but not answered by Tommy’s. Please call your GP or maternity unit if you have concerns about your health or your baby’s health.
    • By Aydee (not verified) on 31 Mar 2017 - 21:46

      Hey ladies im 18 weeks pregnant with my second child.. But my first never really moved... So i dont know what it feels like to feel them kick nor move... What does it Feel like?

    • By Midwife @Tommys on 3 Apr 2017 - 09:22

      Hi Aydee.
      Feeling your baby move for the first time can occur anytime between 16-24 wks of pregnancy. It can feel like bubbles or butterflies in the earlier weeks until the movements become more obvious.

    • By Angel (not verified) on 10 Mar 2017 - 07:13

      Excited to know what I'm havin !!!! Not sure if I feel any movement yet lol

    • By Queen (not verified) on 20 Mar 2017 - 15:06

      I'm 18 weeks also but I have have been feeling movements for about a month or so now. My mom suggested I may be farther along than I think, but I swore I did my calculations correctly lol. This is my first pregnancy by the way. Congrats to you and your bundle.

    • By Midwife @Tommys on 20 Mar 2017 - 15:12

      Hi Queen. Your dating scan would be fairly accurate, so I am sure your dates aren't wrong. It is possible to feel "bubbles" from 14 weeks, but often these go unnoticed until the movements become a little more definitive.But either way, this is normal! Congratulations!!!

    • By Mackenzie (not verified) on 17 Jan 2018 - 17:00

      I am 18wks with my second, and I started feeling little flutters at 13-14 weeks this time. I was small for my frame and they said that has alot to do with it. (Less abdominal wall to feel kicks through) i now feel movement almost every day and they are becoming stronger, and baby is active longer. Feeling movement, for me anyway is reassuring. You know baby is okay. I'm the next 6 weeks or so, you will start to feel a pattern developing, and by 24-25 weeks, counting kicks and feeling movement from the outside will be possible.

    • By Midwife @Tommys on 27 Feb 2017 - 16:29

      Hi there. Congratulations on your 4th pregnancy. You must remember that every pregnancy (and baby) is different and can affect your body and how you feel differently each time.
      Feeling anxious is often a common part of pregnancy, but you can speak to your midwife about this and she/he can help to support you in any way you feel helpful - with more frequent appointments, or referral for more support and help eg counselling. Please don't be afraid to speak to your midwife openly, she/he will not judge you on anything that is said. Asking for help is always a positive step forwards.
      Please feel free to call us on our pregnancy line too if you feel that a chat with one of us on the midwifery team would be useful for you.

    • By Anonymous (not verified) on 27 Feb 2017 - 16:17

      on my fourth child and this pregnancy is alot worse then the others im getting every symptom the anxiety just started ready for August 8th to come

    • By Soon to be mom ... (not verified) on 17 Jan 2017 - 04:50

      It's so exciting to feel my baby move I can't wait to know what we're having...
      Hoping for a boy

    • By Sara (not verified) on 26 Dec 2016 - 10:53

      Yes,the very much useful

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