From this week the baby is just going to grow and mature towards the birth. The kidneys start to produce urine. The eyes are clear and covered by a thin skin layer that will become eyelid, but the baby can not open the eyes before 5-7 month.
In week 8 the baby is still growing very fast, around 1 millimeter every day. In the brain, the pituitary, that controls the production of the hormones are developing now.