Who am I?

What happens in weeks 4 to 8?

By the end of week 8 (the 10th week of pregnancy), all the different parts of the body are in place. Fingers and toes form - the embryo now has unique fingerprints. Its head is still very large compared to its body - almost half its length. The brain is growing at about 100,000 new brain cells every minute. All embryos look identical at seven weeks, before the sex-determining gene is switched on in males.