Using Nägele's rule, what is the estimated delivery date of a patient whose last menstrual period started on December 1?

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September 8 is determined by using the first day of the last menstrual period, subtracting 3 months, and adding 7 days. Subtract 3 months rather than 4, and add 7 days. Subtract 3 months rather than 4, and add 7 days rather than 9. After subtracting 3 months, add 7 days instead of 3.

Using Nägele's Rule, What Is the Estimated Delivery Date of a Patient