Estimated Date of Delivery (EDD) refers to the predicted date when a pregnant woman is expected to deliver. EDD is just an estimate and not an exact date. Only about 5% of women actually deliver on their EDD, and the majority of women deliver within 2 weeks before or after their EDD.

How is EDD Calculated?

EDD is usually calculated based on the first day of the woman's last menstrual period (LMP). Doctors can use various methods to calculate EDD.

• Naegele's rule, adds 280 days (40 weeks) to the first day of the LMP (or 266 days to date of egg retreival in case of IVF)

• Early ultrasound

Why is EDD Important?

EDD is an important date because it helps doctors and other medical professionals to monitor the progress of a pregnancy and ensure that the baby is healthy and growing properly. During prenatal visits, doctors can check the size and position of the baby, monitor the mother's health, and make sure that everything is on track for a healthy delivery.

Additionally, EDD can help parents to plan for the arrival of their baby. Knowing the estimated due date can help parents to prepare for the birth, including choosing a hospital, arranging for childcare for older children, and purchasing necessary baby supplies.

What Happens if the Baby is Not Born by the EDD?

If the baby is not born by the EDD, doctors may perform additional tests and exams to ensure that the baby is healthy and that the mother is not experiencing any complications. Depending on the circumstances, doctors may recommend inducing labor or performing a cesarean section to ensure the safe delivery of the baby.