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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.
Monday's release marks the first time ACOG has issued a formal statement on how best to ascertain a woman's estimated due date, Goldberg added. Overall, a high-quality ultrasound in a woman's first trimester is the most accurate method of establishing or confirming the gestational age of the fetus.