Your baby is about 8 cm (head to bottom of the butt) and weighs about 40 grams....now his body is growing faster than his head....this week he will be covered with very fine hair that will be lost before birth....eyebrows and head hair will start to grow but after birth they may change in gender and color....he....you have until this week to do the screening test in the first 3 months to reduce the risk of the syndrome Identify Down (Mongolism) and some other chromosomal diseases.... Actually, from the 11th week of pregnancy until 13 weeks and 6 days you have to do this screening which includes blood test and ultrasound... thin.... Arms: Arms will grow in proportion to this week and will be longer than your body by the end of the week: the baby's facial muscles will become more active and can look left, frown and smile.... Fluffy: Fluffy hair covers her body like a very delicate ray....