Thirty-three weeks into your pregnancy, or 31 weeks after conception, your baby’s pupils can change size in response to a stimulus caused by light. Your baby is around 43.7cm long from head to heel. That’s approximately the size of a pineapple. Your baby’s brain and nervous system are now fully developed. The bones are hardening up, apart from the skull bones, which will stay soft and separated until the baby’s around 12 to 18 months old.
