The Prenatal Period
Naegele's Rule
Determines the first day of the last menstrual period
Subtract 3 months
Add 7 days
Example: May 7, 2022
Subtract 3 months = February
Add 7 days: February 14
Expected date of birth: February 14, 2023
Determines the first day of the last menstrual period
Subtract 3 months
Add 7 days
Example: May 7, 2022
Subtract 3 months = February
Add 7 days: February 14
Expected date of birth: February 14, 2023