During this week your baby is about 7cm long and weighs approximately 18g. He/she makes different spontaneous movements with his/her body. On one hand, these are due to the many developed muscles. On the other hand, to the fact that the brain is still underdeveloped to control them. This is exactly the period when the nervous cells (the so called neuroblasts) experience their stormy development. Neuroblasts not only propagate but also move closer to the sensorium.
A group of cells named islets of Langerhans is being formed in the baby’s pancreas. They are of crucial importance as they form insulin and glycogen. However, the liver of your midget is quite big in comparison to the other parts of the body. It is about 10% of the weight of his/her body.
The bulbs of the hairs and of the hair commence their formation in the deepest layer of the skin. They will continue their development and in a few months you will feel the touch of the soft head while petting your child.