Baby Size
Week 31

Your Baby is the Size of a Coconut

Week 31

Coconut

Length

41.1 cm / 16.2 in

Weight

1502 g / 53.0 oz

All five of your baby's senses are fully functional, and the rapidly developing brain is processing information constantly.

Development at Week 31

At 31 weeks, your baby is urinating approximately half a liter of fluid into the amniotic sac each day. The lungs are the last major organ to reach full maturity, and surfactant production is steadily increasing to prepare for independent breathing. Your baby is spending more time in a head-down position as space in the uterus becomes more limited.

Next week

At week 32, your baby will be the size of a Squash.
See Week 32

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