Credit: DR NAJEEB LAYYOUS, www.layyous.com/SCIENCE PHOTO LIBRARY

Caption: 20-week-old foetus, 3D ultrasound scan. At this stage, during the 20th week of development, the foetus measures around 25 centimetres in length. The foetus has started to move, and the limbs have developed. Birth occurs at around 38-40 weeks. Ultrasound scanning uses the reflected echoes of high-frequency sound waves to image an unborn baby. This safe, non-invasive method is used routinely in pregnancy to assess the growth and health of the developing foetus, and detect any abnormalities. The standard anomaly scan is carried out when the mother is 20 weeks pregnant. The detection of a serious anomaly at this stage (halfway through pregnancy), allows surgery or a termination to be considered.

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20-week-old foetus, 3D ultrasound scan

K007/0311 Rights Managed

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Duration: 00:00:21.07

Frame size: 480x640

Frame rate: 25

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Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 113.7M

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Capture format: Digital Image Sequence

Frame size: 6480x480

Codec: MS-CRAM

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