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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.
Therefore, if information from an ultrasound is available -- or if the date of the woman's last menstrual period is known -- health care providers should estimate the woman's due date and record it in her files as early as possible, using whatever they believe to be the best obstetrical method.