How Your Body Changes from Week 20 to Week 40: What to Expect

Somewhere in the second half of my pregnancy, I looked down and could not see my feet.

I was craving hot and spicy soup. And someone looked at the shape of my bump and told me it was a boy.

The first trimester gets all the attention: the nausea, the exhaustion, the first scan. The second half is when your body changes the most, and people talk about it the least.

So here is what to expect from week 20 to the finish line, from one mum to another.

Weeks 20 to 27: the sweet spot

For many mums, this is the nicest part of pregnancy. The first-trimester fog has usually lifted, and your bump is cute, not heavy.

Your bump goes public. By week 20, the top of your uterus has reached your belly button. From here, it grows about a centimetre a week.

This is also when the comments start. Mine was "it looks like a boy", based purely on bump shape.

For the record, bump shape comes down to your muscles, your build and how baby is lying. It cannot tell you who is in there. We have more pregnancy myths here.

You may feel baby move for the first time. It is called quickening, and it feels like a flutter or a tiny bubble. By weeks 24 to 25, there is no mistaking it.

Your breasts keep changing. Some mums notice colostrum, their first milk, starting to leak. A soft, wire-free nursing bra makes the days more comfortable while your size keeps shifting.

You get sharp little twinges. That is round ligament pain: the ligaments holding your uterus are stretching. It tends to catch you when you stand up or turn quickly.

And then you start to waddle. Your centre of gravity is moving forward, which is also why your lower back begins to ache.

Weeks 28 to 35: getting heavier

This is when pregnancy gets physical. Getting off the sofa takes a plan.

Your feet disappear. One day you look down and there is only bump. Slip-on shoes become your best friends.

Your bump tightens, then lets go. These are Braxton Hicks, or practice contractions. They last 30 to 60 seconds, come irregularly, and are usually more uncomfortable than painful.

Your ankles puff up. Your body is holding on to more fluid. Feet up, water bottle close.

Heartburn arrives. Your uterus is pressing up on your stomach. If you are craving hot and spicy soup like I was, the timing is unfair. Smaller, more frequent meals help.

You may also get breathless on the stairs. Your lungs simply have less room.

Sleep becomes a project. Side sleeping is usually the most comfortable from here, with a pillow between your knees and one behind your back. Turning over may involve a small grunt. Our guide to sleep positions for every trimester has more.

Your skin itches. It is stretching fast, and stretch marks may show up on your belly, hips and breasts. Moisturiser will not stop them, but it does ease the itch.

Weeks 36 to 40: getting ready

The final stretch.

Baby drops lower. This is called engagement. Breathing gets easier, and you will need the loo more than ever.

You suddenly need to organise everything. That is nesting. Enjoy the burst of energy, then sit down.

Your cervix starts to soften and thin. You will not feel this one. It happens quietly in the weeks before labour.

The tightenings come more often. How do you tell them from the real thing? True labour contractions are regular, get stronger, and do not ease when you rest or move.

When to call your doctor

Most of what you feel in these weeks is normal. A few things are worth a call straight away.

- Baby is moving less than usual, or the pattern has changed
- Any bleeding, or fluid leaking from your vagina
- A severe headache, blurred vision, or sudden swelling in your face or hands
- Regular, painful contractions before 37 weeks

You are never wasting anyone's time by checking.

A note before you go

Every pregnancy is different. Some mums sail through these weeks, and some count down every single day.

I hope knowing what is coming makes the surprises a little smaller.

If anything feels off, trust yourself. You know your body better than anyone.

And if you are craving the soup, have the soup.

Read next: Can you wear nursing bras while pregnant?

Learn More:

Sources:

1. Cleveland Clinic: fundal height, and how the top of the uterus reaches the belly button by around week 20
2. Mayo Clinic: fundal height roughly matching weeks of pregnancy from the second trimester onward
3. NHS (UK): quickening, Braxton Hicks, the signs of approaching labour, and when to seek urgent advice
4. American College of Obstetricians and Gynecologists (ACOG): third-trimester changes, engagement, and effacement
5. KK Women's and Children's Hospital (KKH): antenatal care and what to expect through pregnancy

Additional resources: NHS pregnancy week-by-week guide, ACOG patient resources, HealthHub Singapore (antenatal care)

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