HENNING DALHOFF / SCIENCE PHOTO LIBRARY HENNING DALHOFF / SCIENCE PHOTO LIBRARY
Embryo and foetus development. Illustration of the stages in the development of a human embryo from week 3 (left) to week 38 (right). The developing baby is an embryo from just after conception to around 8 weeks (centre). It is then known as a foetus from around 8 weeks until birth, which occurs around week 39 to 41.
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