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How Accurate is Your Estimated Due Date?

By ceridwen |

Statistically you have about a 3% chance of giving birth on your estimated due date (EDD). The EDD is a good guess as to when the baby will be born; but it’s based on an average. The reality for first time mothers is that the baby is more likely to arrive several days after the EDD. Some studies show that Caucasian women tend to gestate longer than African and Asian women. There are other factors to consider, including the length of your cycle.  I am working on my own totally unscientific, anecdotal study correlating height with pregnancy length. The point is every pregnancy is set on its own timer. Having a baby at “term”  does not mean 40 weeks to the day, but rather any time between 37-42 weeks! It’s not really a day you’re looking for but a five week period…

It is for this reason, I was thrilled to discover an online calculator that will give you both your due date and your due month.

It can be hard to let go of the date you’ve been given. Everyone wants to know when you’re leaving work. Families want to know when they can fly in. Anxiety about passing the EDD can be upsetting or prompt interventions that may not be necessary. I wish I could link you to a site that would tell you the minute contractions will start. Having a due month– though logical– can be way too unwieldy a time frame!  How about we compromise and settle on a due fortnight?

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About ceridwen



Ceridwen Morris is a writer, mother, and certified childbirth educator. She is the author of several books and screenplays, including (Three Rivers; 2007). She serves on the board of The Childbirth Education Association of Metropolitan New York and teaches at Tribeca Parenting in New York City. Read bio and latest posts → Read Ceridwen's latest posts →

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0 thoughts on “How Accurate is Your Estimated Due Date?

  1. Rosana says:

    I gave birth right on my due date for my first pregnancy but had to be induced for my second pregnancy 3 past my due date :(

  2. Lucky says:

    I dig that. A due fortnight lol!

  3. PlumbLucky says:

    Ditto that. It would make things perhaps easier to explain to work that “well…I’m due on, but realistically….”

  4. jil says:

    I delivered two weeks before my due date like i told my doc i wud because i know my cycle better then any person

  5. MayasMomma214 says:

    I hadn’t had a period in over 1 1/2 years so my due date is based off her size at 13 wks.

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