31 weeks pregnant
At 31 weeks pregnant, your baby is about the size of a coconut: around 41.1 cm head to heel and 1.50 kg. Baby can turn their head from side to side.
Your baby at 31 weeks
Baby can turn their head from side to side.
| Size | About the size of a coconut |
|---|---|
| Length | 41.1 cm head to heel |
| Weight | 1.50 kg |
Your baby can now turn its head from side to side, and all five senses are working. Your baby is putting on weight quickly as layers of fat build up under the skin, smoothing out the wrinkles. The lungs are still maturing. You might notice your baby has very busy times and quiet times each day.
How far along are you at 31 weeks?
At 31 weeks pregnant you are in the seventh month of your pregnancy and the third trimester. You have about 9 weeks to go until your due date. Doctors count pregnancy from the first day of your last period, not from conception, so at 31 weeks your baby has been growing for about 29 weeks. Not sure of your dates? Use our due date calculator.
Your body at 31 weeks
Breathlessness and practice contractions (Braxton Hicks) are common. Sleep on your side and get to know your baby's pattern of movements.
Common symptoms at 31 weeks
Every pregnancy is different, and you may have some, all or none of these.
- Leaking colostrum. Normal; breast pads help.
- Stronger Braxton Hicks. Your bump may feel tight and hard for a minute or so.
- Breathlessness. Take things slowly and rest often.
- Pelvic pain. Pain at the front of your pelvis or in your hips when walking or turning over.
- Trouble sleeping. Pillows can make a big difference.
- Leaking urine. When you cough or sneeze. Pelvic floor exercises help.
Your checklist for week 31
- Have your whooping cough vaccine by 32 weeks if you haven't yet.
- If your placenta was low-lying at 20 weeks, check your follow-up scan around 32 weeks is booked.
- Buy a car seat and get it fitted correctly.
- Prepare a safe sleep space: a cot or crib with a firm, flat mattress and no pillows, bumpers or soft toys.
- Start packing your hospital bag.
Tip of the week: Easing pelvic girdle pain
Pelvic girdle pain is common. Keep your knees together when getting in and out of the car or bed, sit down to get dressed, avoid standing on one leg and take smaller steps. Sleep with a pillow between your knees. A physiotherapist can help a lot, so ask for a referral if it limits your walking.
For your partner
Third trimester. Time to learn the tools.
- Learn the warning signs and when to call
- Install the car seat
- Join an antenatal class together
When to call your doctor at 31 weeks
Contact your doctor, midwife or maternity unit the same day if you have:
- Your baby is moving less than usual.
- Signs of premature labour: regular tightenings, period-like pain, backache that comes and goes, fluid, or a feeling of pressure.
Call your doctor or hospital straight away for bleeding, severe pain, fluid leaking, severe headache or vision changes, or fewer baby movements.
Questions about 31 weeks pregnant
Is pelvic pain normal at 31 weeks?
Pelvic girdle pain, also called SPD, affects many pregnant women. It feels like pain over the pubic bone, in the hips or between the legs, especially when walking, climbing stairs or turning in bed. It is not harmful to your baby, and physiotherapy can help.
What are the signs of premature labour?
Regular tightenings or contractions, period-like cramps, a dull backache, pressure in your pelvis, a change in discharge, or a gush or trickle of fluid before 37 weeks. Contact your maternity unit straight away if you notice any of these.
What does a baby need to sleep safely?
Place your baby on their back to sleep, in a cot or crib with a firm, flat, waterproof mattress, in the same room as you for at least the first six months. Keep the cot clear of pillows, bumpers, blankets and toys, and keep the room smoke-free and not too warm.