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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.
The most accurate due dates are going to be those based on very early ultrasound and on ovulation or last menstrual period dates that are accurate. Some practices have been known to try to alter a due date based on an ultrasound done at 20 weeks, but these are less accurate.