BSIP, VEM / SCIENCE PHOTO LIBRARY BSIP, VEM / SCIENCE PHOTO LIBRARY
Nine week old foetus. Coloured ultrasound scan (sonogram) of a 9 week old healthy foetus in the womb, seen in side view. The foetus body appears red, its larger head is coloured yellow, floating in the black amniotic sac. The umbilical cord is visible at above centre, with the placenta (pink) formed around part of the amniotic sac. The crown-rump length (sitting height) of a foetus aged 9 weeks is about 5cm and its weight about 10 grams. Ultrasound scanning uses high-frequency sound waves to obtain an image of the foetus in the uterus, and is a diagnostic tool to confirm foetal age and to detect any malformations.
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