Question 1

What is Naegele's Rule?

Accepted Answer

Naegele's Rule estimates the due date by adding 280 days (40 weeks) to the first day of the last menstrual period (LMP), adjusted for cycle length variations from the standard 28-day cycle.

Question 2

How accurate is the due date calculation?

Accepted Answer

Only about 5% of babies are born on their exact due date. Most births occur within two weeks before or after the estimated due date. The calculation provides a useful estimate for planning purposes.

Question 3

What are the three trimesters?

Accepted Answer

First trimester: weeks 1-12. Second trimester: weeks 13-26. Third trimester: weeks 27-40. Each trimester involves different stages of fetal development and maternal changes.