Third trimester
36 weeks pregnant: what is happening this week
Week 36 of 42worked example
47.4 cm
- Measured
- head to heelabout the size of a romaine lettuce
- This week runs
- Thu, Sep 3, 2026 to Wed, Sep 9, 2026
- Days to the estimated due date
- 35
- Term window (37-42 weeks)
- Thu, Sep 17, 2026 to Thu, Oct 22, 2026
The NHS publishes this figure for week 36, about the size of a romaine lettuce. It is an average from patient guidance rather than a measurement of any particular pregnancy, and the measurement basis changes at week 20 - see the note below the dates.
47.4 cm, and the lungs are likely mature enough to work independently. Sucking and digesting breast milk are both possible. The head may have moved down into the pelvis. There is an antenatal appointment this week and its focus is position: which way up, how far down, and what that means for the plan. Blood pressure, urine and bump measurement as usual. Light leaking of urine when laughing or coughing is common by now and is a pelvic floor consequence rather than anything else. Braxton Hicks continue. Four weeks to the estimate and the odds of an earlier arrival are now meaningful, which makes this the week to sort the handover list - who covers your work at an hour's notice, who has keys, who is looking after anything that needs looking after. Write it down and send it to the people on it. The whole point of a handover is that it works when you are unreachable, and from this week onwards being unreachable can happen without notice.
Put your own dates on week 36
- Week 1 began
- Thu, Jan 1, 2026
- Week 36 begins
- Thu, Sep 3, 2026
- Week 36 ends
- Wed, Sep 9, 2026
- Estimated due date
- Thu, Oct 8, 2026
Dates run on ACOG's 280-day convention, the same arithmetic as the due date calculator. Share this week with your dates: /pregnancy/week-36?s=d:2026-10-08
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What the NHS describes this week
- The NHS puts the baby at around 47.4 cm from head to heel this week.
- The lungs are likely mature enough to breathe independently.
- Sucking and digesting breast milk are both possible, and the head may have moved down into the pelvis.
What happens around now
A 36-week antenatal appointment checks the baby's position along with blood pressure, urine and bump size. Light leaking of urine when laughing or coughing is common at this stage.
- 36-week antenatal appointment - baby's position, blood pressure, urine, bump measurement (NHS)
On the measurement. The NHS publishes a length for each week from 4 to 40. Up to week 19 it is measured head to bottom (crown to rump, the measurement a scan takes while the legs are curled). From week 20 it is measured head to heel, which is why the figure jumps from 15.3 cm at week 19 to 25.6 cm at week 20 - the baby did not grow 10 cm in a week, the ruler changed. The NHS states the change on its week 20 page.
Where week 36 comes from
- NHS: week 36 of pregnancy
- NHS: your antenatal appointments
- NHS, Week-by-week guide to pregnancy — the guide these weeks are built from
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