Week 31
Trimester 3Days 30+0 to 30+6
Baby is now the size of a large coconut
Welcome to Week 31. Your baby is now growing rapidly and looking more and more like the newborn you will soon meet. The body is becoming rounder, the brain is developing at an incredible pace, and movements remain strong and noticeable. Birth is getting closer, preparations are becoming more urgent, and you may find yourself imagining your baby more often than ever before.
Length
40–41 cm
15.7 in–16.1 in
Weight
1.5–1.7 kg
3.3 lb–3.7 lb
Development highlights
- check_circleYour baby is building fat stores, muscle tissue, and energy reserves, giving them the rounded appearance of a newborn.
- check_circleThe brain continues forming new neural connections, deeper folds, and more advanced communication pathways — controlling increasingly complex movements and body functions.
- check_circleAll five senses continue maturing — hearing sounds, detecting light, experiencing touch, and tasting flavors in amniotic fluid.
- check_circleSleep cycles are more organized with more predictable periods of sleep, wakefulness, activity, and rest.
- check_circleSurfactant production continues increasing as the lungs become more prepared for breathing after birth.
This week's milestones
- check_circleAll five senses actively developing.
- check_circleSleep cycles more organized and predictable.
- check_circleBrain controlling increasingly complex functions.
- check_circleResponding to familiar sounds and voices.
Fun fact
Your baby may now turn their head toward familiar sounds and voices they hear regularly.
Weekly checklist
- Continue prenatal vitamins.
- Stay hydrated.
- Eat balanced meals.
- Stay active.
- Monitor baby movements.
- Continue preparing for labor and postpartum recovery.
Frequently asked questions
Is it normal to feel exhausted again?
Yes. Many women experience increasing fatigue during the third trimester due to carrying extra weight and disrupted sleep.
Why are the baby's movements so strong?
Your baby is larger, stronger, and has developed more muscle mass.
Should I be worried about Braxton Hicks contractions?
Occasional irregular Braxton Hicks contractions are common. If contractions become regular, painful, or concerning, contact your healthcare provider.
Is it normal to feel overwhelmed by birth preparation?
Absolutely. Many parents feel both excited and nervous as birth gets closer.
Related tools
shopping_bagHelpful picks for Trimester 3
Browse all pregnancy products →Frida Mom Motherload Hospital Bag
30-piece pre-packed hospital bag covering labor, postpartum, and newborn grooming — organized in removable toiletry bags.
Momcozy M5 Wearable Electric Breast Pump
Hands-free wearable electric pump that fits discreetly in your bra — portable and quiet for pumping on the go.
Birth Comb & Acupressure Massage Ball
Labor pain relief set using acupressure — hold the comb during contractions to activate pressure points.
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Medical information disclaimer
The content on this page is provided for general informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment.
Always consult your GP, midwife, health visitor, paediatrician, or other qualified healthcare provider before making decisions about your health or your child's health and development. Never ignore or delay seeking professional advice because of something you have read on BabyScout. If you think there is a medical emergency, call 999 (UK) or your local emergency services immediately.