JOSH SHER / SCIENCE PHOTO LIBRARY JOSH SHER / SCIENCE PHOTO LIBRARY
Foetus. Coloured ultrasound scan of a human foetus at 20 weeks of pregnancy, with its mouth open. At 20 weeks a foetus has developed all its limbs and organs. One arm (dark) is seen at the side of its head. Its legs are at centre right and its spine (pink/white) is at lower centre. The crown-rump (sitting height) of a 20 week old foetus is about 20 centimetres and it weighs about 500 grams.
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