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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 evidence suggests that ultrasound is more accurate than the last menstrual period date in predicting when the baby will be bornâbut only in the first trimester (weeks 1 through 12) and early second trimester (until roughly 20 weeks.) During the first 20 weeks of pregnancy, the margin of error is roughly 1.2 weeks.