RUSSELL D. CURTIS / SCIENCE PHOTO LIBRARY RUSSELL D. CURTIS / SCIENCE PHOTO LIBRARY
Foetal scan. Ultrasound scan of the profile of a human foetus at 23 weeks of pregnancy (nearly 6 months). The head is at right with the face of the foetus at top; the torso is at centre and left; an arm and hand are also seen. At this stage the face is completely human with lips, nose, eyelids and external ears (not all visible here). The crown-rump length (sitting height) of the foetus is about 22cm and its weight some 750 grams. The head of a foetus at this age is proportionately large compared to its body. Ultrasound uses high-frequency sound to create an image of the foetus inside the womb, to detect whether development is normal.
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