DR NAJEEB LAYYOUS / SCIENCE PHOTO LIBRARY DR NAJEEB LAYYOUS / SCIENCE PHOTO LIBRARY
Foetus at 9 weeks (first trimester), ultrasound scan. The foetus is seen with its head at centre and facing with its its feet towards the left. Ultrasound scanning uses high-frequency sound waves to create an image of an internal structure. Foetal ultrasound scanning is routine during pregnancy.
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