Your baby at 31 weeks
The baby can move the limbs and turn the head. The brain and organs continue maturing.
Periods of activity and rest may become familiar to you. A change from that pattern needs assessment.
TRIMESTER 3 · WEEK 31
31 weeks pregnant
Developing familiar patterns.
What to expect at 31 weeks pregnant: your baby, your symptoms and this week’s reminders.
Symptoms at 31 weeks pregnant
- Movements may feel like rolls or stretches.
- Backache and tiredness may occur.
- You may have difficulty sleeping.
None of these symptoms is required. Symptoms alone cannot diagnose pregnancy or establish your baby’s wellbeing.
Contact your pregnancy-care team immediately for reduced, absent or changed movements.
Source for this week: NHS — Week 31
Measurement note: early lengths are head-to-bottom; from week 20 they are head-to-heel. The numbers across that change should not be compared as if the measurement method were the same.
YOUR WEEK, YOUR JOURNEY
Explore another pregnancy week
Choose a week to explore your baby’s development and changes you may notice.
01 · FIRST TRIMESTERSmall beginnings
02 · SECOND TRIMESTERA growing connection
03 · THIRD TRIMESTERGetting closer to meeting
Sources and content note
This is source-based general information, not a substitute for a clinical assessment or individual care plan. The presence, absence or change of symptoms alone cannot establish pregnancy wellbeing. This content is not a personalised care plan reviewed by a healthcare professional.
This guide groups weeks 1–13 in the first trimester, 14–27 in the second, and 28 onwards in the third. Weeks refer to gestational age dated from the last menstrual period; clinical dating may differ.
- NHS — Pregnancy week by week
- ACOG — Fetal development and gestational age
- NHS — Your baby’s movements
- NHS — Pregnancy symptoms
Sources checked: 31 October 2026 · Illustrations are AI-generated conceptual drawings, not ultrasound or diagnostic images.