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Due dates are also calculated based on the baby's body length during an ultrasound between eight and 12 weeks of pregnancy, according to Dr. Sachchidananda Maiti, England-based obstetrician and gynecologist.
T he timing of routine scans (18 to 20 weeks) is chosen for pragmatic reasons. It offers a reasonably accurate due date â although dating is most accurate at the early stages of pregnancy, when babies vary the least in size â and the baby is big enough to see most of the abnormalities that are detectable on ultrasound.