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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.
Your doctor will like to do an ultrasound initially at 7-9 weeks in which the baby's due date will be calculated. The second ultrasound is done sometime during the second trimester (often between 16 and 20 weeks) and is done to evaluated growth, look for birth defects and other possible genetic diseases. Sex determination ultrasounds are not a part of the most routine prenatal schedules.