SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY
Coloured ultrasound scan of a 28 week old healthy foetus in the womb, sucking its thumb. The head of the foetus is at centre, with its arm at lower right. The crown-rump length (sitting height) of a foetus aged 28 weeks is about 37 centimetres, and its weight is about 900- 1000 grams. Ultrasound scanning, using high- frequency sound waves, is a diagnostic tool to confirm foetal age and detect any malformations.
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