Correct Answer - Option 2 : Naegele’s rule

**Explanation:**

**The estimated date of delivery** (EDD), also known as the expected date of confinement, and estimated due date or simply due date, is a term describing the estimated delivery date for a pregnant woman. Normal pregnancies last between 37 and 42 weeks.

**Naegele's rule**

- Naegele's rule is named after Franz Karl Naegele, the German obstetrician who devised the rule.
- Naegele's rule is a standard way of
** calculating the due date for a pregnancy** when assuming a gestational age of 280 days at childbirth.
- The
** rule estimates the expected date of delivery (EDD)** by adding a year, subtracting three months, and adding seven days to the origin of gestational age.
- The result is approximately 280 days (40 weeks) from the start of the last menstrual period.
- Another method is by
** adding 9 months and 7 days to the first day of the last menstrual perio**d.

**The formula** to calculate your Estimated Due Date using Naegele's rule :

**Date of Last Menstrual Period + 7 Days + 9 Calendar Months = Date of Estimated Date of Delivery**