Week 19. The baby sleeps and wakes up more fiercely
The nervous system, in particularly the brain, is developing and growing rapidly. The soft cartilage that forms the skeleton of the baby is hardening into bone. On the other hand, the baby makes more active movements that are easier to feel. You will notice that there are times when the baby seems to be asleep and others when it moves a lot. The reason is that it sleeps more and wakes up with more energy.
Now it is up to 15 centimetres. Knowing the baby’s sex is easier and results are more reliable from this week.