MATT MEADOWS / SCIENCE PHOTO LIBRARY MATT MEADOWS / SCIENCE PHOTO LIBRARY
Face of a foetus. Ultrasound scan of a full-term (9 month old) foetus, showing the surface of its face. The oval-shaped head of the foetus takes up most of the scan field, seen lying sideways. Its features clearly visible include closed eyes (at centre and lower centre), mouth with lips closed, chubby cheeks, high forehead (at right). These facial features are fully developed, as seen at birth. At full-term the foetus crown-rump length is about 36 centimetres, and it weighs some 3.4 kilograms. Ultrasound scanning uses high frequency sound waves to produce images of body tissues, and is typically used in pregnancy to assess the development of the foetus.
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