• Pregnancy
• Pregnancy week by week

31 st week of pregnancy: average prematurity in case of birth

At this stage, your baby's pupils may change size in response to light stimulus. His bones are getting stronger but the bones in his skull remain soft and flexible, especially to facilitate delivery and to allow the brain to continue to develop.

If your baby were to be born, he or she would be in a medium level of prematurity, with an excellent chance of survival.