CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Four month old foetus. Coloured digitised ultra- sound scan of a 4 month old healthy foetus in the womb, seen in side view. At lower right is the profile of the head of the foetus, its face pink. Above its face is a hand with fingers visible; the foetus appears to be sucking its thumb. At lower centre is the torso; at centre left is a leg coloured blue. The crown-rump length (sitting height) of a foetus aged 16 weeks is about 14cm and its weight about 200g. These measurements can be determined by ultrasound, high-frequency sound waves, which is a diagnostic tool to confirm foetal age and to detect any malformations.
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