Baby development at week 31
All five senses function in early ways. Processing of sound and light continues. Hiccups can become a familiar daily pattern.
Average size estimates for week 31 are about 41.1 cm and 1502 g — roughly cabbage. Your ultrasound report and clinician’s dating override any website average.
What you might feel
Pelvic pressure and Braxton Hicks may pick up. Practice your “call the clinic if…” checklist with your provider.
You are in the third trimester. Two pregnancies at the same week can feel completely different — treat these notes as orientation, not a checklist you must match.
Movements in week 31
By now, many clinicians encourage intentional awareness of fetal movement. Learn your baby’s usual active window, then use Preglo’s kick counter to log a calm session. Read how to count baby kicks if you want a simple method, or the 10-kick count overview. If movements feel clearly reduced, contact your care provider — see reduced fetal movement.
What to track this week
- Symptoms, mood, sleep, and energy in your daily log
- Water intake toward a simple daily goal
- Appointment dates and questions for your care provider
- Scan dates and follow-up notes after ultrasound visits
- Kick sessions once movements feel regular — same time of day when you can
A calm next step in Preglo
Use contraction timer later only when tightenings become patterned — for now, notes are enough.
Also useful: due date calculator · all weeks · Preglo features
Nearby weeks: Week 29 · Week 30 · Week 32 · Week 33
Educational averages only — not medical advice. Contact your clinician for symptoms that worry you, bleeding, severe pain, or reduced movements.