R. BEVILACQUA, CNRI / SCIENCE PHOTO LIBRARY R. BEVILACQUA, CNRI / SCIENCE PHOTO LIBRARY
Ten week old foetus in its amniotic sac. At this stage the foetus measures about 4 centimetres in length. Foetal movements begin at this time, but are not usually felt by the mother. Internal sexual differentiation takes place but external differences are not yet obvious.
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