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 (yellow) 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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