Thirteen week old foetus. Coloured ultrasound scan of a thirteen week old foetus in the womb. Its head is at centre right, with its body extending to bottom left. This foetus has a crown-rump length of 78 millimetres and weighs approximately 82 grams. At this stage all of the foetus' organs are formed, as are the vocal cords. Ultrasound scanning is a diagnostic technique that sends high-frequency sound waves into the body via a transducer. The returning echoes are recorded and used to build an image of an internal structure. Foetal ultrasound scanning is routine during pregnancy.
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