PH. SAADA / EURELIOS / SCIENCE PHOTO LIBRARY PH. SAADA / EURELIOS / SCIENCE PHOTO LIBRARY
Face of a foetus. Doppler ultrasound scan of the head of a human foetus in profile, at 22 weeks of pregnancy (5.5 months). The face is completely human, with fully developed lips and nose seen. Eyelids and external ears, although not visible here, have developed. Eyebrows, at this stage, are also present and a fine hair has developed on the head. The crown-rump length (sitting height) of the foetus is about 21cm and its weight some 600 grams. The head of a foetus at this age is proportionately large compared to its body. Doppler ultrasound uses high-frequency sound to detect whether foetal development is normal, and can register moving particles like blood or urine.
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