Now about 1.25 centimetres long, the size of a grape, Boo has distinct, slightly webbed fingers and toes. It's a jumping bean, moving in fits and starts. The liver is churning out large amounts of red blood cells until the bone marrow forms and takes over this role. The eighth week marks the beginning of a very busy developmental stage. Between now and 20 weeks, Boo will be growing rapidly, and body parts that formed in the first few weeks of life (such as the heart and brain) will become more specialised and complicated. Right now, the teeth and palate are forming, while the ears continue to develop. The fetus' skin is paper thin, and veins are clearly visible.
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