Question:

Which of the following is true about the expected date of delivery (EDD)?

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The EDD is just an estimate - very few babies actually arrive on that exact day.
Updated On: Jun 24, 2026
  • Less than 10% of deliveries occur on EDD
  • Less than 20% of deliveries occur on EDD
  • 80% of the deliveries occur on EDD
  • 90% of the deliveries occur on EDD
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The Correct Option is A

Solution and Explanation

Step 1: The EDD is calculated using Naegele's rule, which estimates a date 40 weeks from the last menstrual period. It is only an estimate, not a fixed delivery day.

Step 2: In reality, fewer than 5% of all pregnancies actually deliver exactly on the EDD. The majority deliver within about 7 days on either side of the EDD.

Step 3: Around 13% of births are preterm and about 5 to 7% are post term. Because the true figure is under 5%, the statement that less than 10% of deliveries occur on EDD is correct.

Step 4: The other options (80% or 90% on EDD) are grossly overstated and medically false.
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