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These are the most common scans, though they are not offered by every hospital:

 Dating: 8–12 weeks. To assess when baby due.

 Nuchal fold: 11–13 weeks. Looks at thickness at back of baby’s neck. Gives a ‘risk’ of Down’s syndrome, from which you can decide if you want to take further tests (see below). About 80 per cent of Down’s babies are detected in this way.

 Anomaly scan: 19–21 weeks. To assess baby’s overall development. Looks specifically at the development of the palate, brain, spine, bladder, kidneys and stomach.