Pregnancy week by week / Week 18
18 weeks pregnant
That’s 5 months — the second trimester, with 22 weeks to go.
Baby size at 18 weeks
Your baby is about 14.2 cm (5.6 in) long and weighs about 0.19 kg (7 oz) — roughly the size of a bell pepper.
What’s happening at 18 weeks
The baby is becoming more active — yawning, hiccuping and rolling. An anatomy ultrasound around now can often reveal the sex.
Common symptoms at 18 weeks pregnant
- •Noticeable movements
- •Dizziness from low blood pressure
- •Backache
- •Leg cramps
- •Swollen feet
Every pregnancy is different — you may have all, some or none of these. Contact your doctor or midwife about anything that concerns you.
Count down to your due date
If you’re 18 weeks pregnant today, your due date is around Tuesday, November 17, 2026. Adjust the date below and create a free countdown to share.
First day of your last menstrual period (how doctors date a pregnancy)
⚕️ This is an estimate based on Naegele’s rule (40 weeks from your last period). Only about 1 in 20 babies arrive on the exact due date. Always confirm with your doctor or midwife.
FAQ
How many months is 18 weeks pregnant?
18 weeks pregnant is about 5 months, in the second trimester.
How big is the baby at 18 weeks?
At 18 weeks the baby is about 14.2 cm (5.6 in) long and weighs about 0.19 kg (7 oz) — roughly the size of a bell pepper.
What are the symptoms at 18 weeks pregnant?
Common symptoms around 18 weeks include noticeable movements, dizziness from low blood pressure, backache, leg cramps. Symptoms vary a lot from person to person — contact your provider if anything worries you.
When is my due date if I am 18 weeks pregnant?
If you are exactly 18 weeks pregnant today, your estimated due date is around Tuesday, November 17, 2026 — 22 weeks from now. Use the calculator below with your real last-period date for a personalised estimate.
See every stage on the pregnancy week-by-week guide or open the full due date calculator.