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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.
Ultrasounds performed after 22 weeks gestation cannot be used to estimate the due date of the baby because the size no longer reflects the age very well. Even average babies can differ by up to 2 to 3 weeks of growth;.These scans are only used to estimate the due date of your baby if this is all you have to go on. dating scan is an ultrasound examination which is performed in order to establish the gestational age of the pregnancy. Dating scans also reveal other important information such as: