Pregnancy Week 31
Your baby is the size of a Pineapple - 41.1 cm, 1502 g
Your Baby at Week 31
Development highlights
- All five senses are now functional
- Baby can recognise your voice, favourite music, and familiar sounds
- Iris is now pigmented - Though eye colour may change in the first year
- Toenails and fingernails have reached the tips of the digits
Source: WHO Child Growth Standards; embryology references from Moore & Persaud.
Your Body in Week 31
The third trimester brings the final preparations for birth. Your body is working harder than ever - Baby is gaining 200g a week and space is running short. Use the Contraction Timer and the Kick Count Tracker to stay in tune with your baby from now on.
Common symptoms this week
Week 31 Checklist
- Finalise your birth plan and share it with your OB and midwife team
- Attend antenatal classes if you haven't completed them yet
- Sign up for breastfeeding support (KKH, NUH, and Thomson all offer classes)
- Decide on formula milk brand and have some on standby even if planning to breastfeed
B12 is essential for nervous system development. Meat, fish, dairy, and eggs are the main sources. Vegetarians and vegans must supplement - Plant sources provide negligible B12.
Baby's Body Systems Development
How far along each major system is at week 31. Development is continuous - The chart shows when each system is actively forming and when it reaches maturity.
Third Trimester: Birth Preparation Guide
Weeks 28–40 are the final sprint. Baby is gaining weight rapidly, your body is preparing for labour, and the countdown is real. This is the time to finalise your hospital choice, pack your bag, choose your paediatrician, and learn the signs of labour. Antenatal visits increase to every 2 weeks, then weekly from week 36.
Hospital bag essentials - Singapore maternity wards
- Nightgown x2 (front-opening)
- Maternity pads (heavy flow)
- Breast pads + nipple cream
- Toiletries & lip balm
- Phone charger
- Snacks for labour
- Going-home outfit (sizes 0000/000)
- Swaddle blankets x2
- Car seat (must install before)
- Mittens and booties
- Dummy (optional)
- NRIC / passport
- Hospital pre-registration form
- Birth plan (2 copies)
- Insurance card
- OB's contact number
- • Contractions: 5 minutes apart, 1 minute long, for 1 hour (5-1-1 rule)
- • Waters break - Go within 1 hour regardless of contractions
- • Heavy vaginal bleeding
- • Baby's movements reduce significantly - Fewer than 10 in 2 hours
- • Severe headache, vision changes, or upper abdominal pain (pre-eclampsia signs)
Frequently Asked Questions - Week 31
Real labour contractions follow a regular pattern: they come at consistent intervals, last 45–60 seconds each, and get progressively stronger, longer, and closer together over time. Braxton Hicks, by contrast, are irregular, don't intensify, and often ease when you change position or rest. Other labour signs include the 'bloody show' (blood-tinged mucus plug), your waters breaking, or persistent lower back pain that worsens in waves.
Follow the 5-1-1 rule: go to hospital when contractions are 5 minutes apart, lasting 1 minute each, for at least 1 hour. Go immediately if: your waters break (regardless of contractions), you have heavy vaginal bleeding, your baby's movements reduce significantly, or you develop a severe headache, vision changes, or upper abdominal pain. In Singapore, call your hospital's labour ward 24-hour line - They'll advise you.
The Baby Bonus scheme provides a cash gift of $11,000–$13,000 for the first two children and $13,000+ for the third and beyond, plus government matching into a Child Development Account (CDA) up to $6,000–$9,000. Register at the Baby Bonus Online portal within 60 days of birth. Read the full HeyBaby Baby Bonus guide for a step-by-step claim walkthrough.
Week 31 at a glance
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