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Pregnancy Guide·Third Trimester

Week 31: Five Senses Active

Coconut (~28cm crown-rump)·Last reviewed: 25 April 2026
Quick answer

At week 31, all five of your baby's senses are active. They can see, hear, taste, touch, and smell. According to Nuhah's pregnancy guide, your baby weighs about 1.5kg and is practising breathing movements regularly.

Baby development at week 31

The baby can process visual information, respond to sounds, taste the amniotic fluid, and feel touch. Chemical detection similar to smell is also present, though true olfactory experience in utero is not fully established. They are practising breathing movements regularly. The baby weighs about 1.5kg and is roughly 41cm from head to toe. The reproductive organs are continuing to develop internally.

Your body this week

Shortness of breath, backache, and difficulty sleeping are all common. Your breasts may start leaking colostrum. Braxton Hicks may become more noticeable. Frequent urination returns as the baby puts pressure on your bladder. You may experience increased Braxton Hicks after physical activity.

Things to do this week

1
Rest whenever you can
2
Practice breathing techniques for labour
3
Continue regular midwife appointments
4
Install the car seat if you haven't already

Frequently asked questions

What can my baby sense in the womb?

By week 31, all five senses are active. Your baby can hear your voice and music, see light through the uterine wall, taste flavours in the amniotic fluid, feel touch and pressure, and even detect certain smells. Talking and singing to your baby helps with bonding.

Related reading

Guides
NHS Pregnancy Appointments: The Complete Timeline

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