| http://www.w3.org/ns/prov#value | - It is quite common for a woman to have two or more scans during the course of her pregnancy; one early on (at about 12 weeks' gestation) in the pregnancy to confirm the baby's estimated date of delivery and a later one (at about 16 weeks) to examine the baby in more detail in order to exclude certain abnormalities including spina bifida.
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