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A reason why there are so many November birthdays

Here’s something that seems pretty obvious but haven’t really thought about it.

I’m checking my Facebook account and I’ve noticed that many people have their birthdays around this time of year. And I always wondered how that came to be?

Then I realized something very obvious. And even though I needed a friend to figure this out, who in fact just celebrated his birthday on November 14, a day after my dad had his, it all made sense to me.

If you either on November 14 or a little bit after, chances are you were conceived around on Valentine’s Day.

It’s logical really – exactly nine months after is November 14. That doesn’t necessarily mean you were conceived on Valentine’s Day. Pregnancy normally about 38 weeks after conception while The World Health Organization defines normal term for delivery as between 37 weeks and 42 weeks. The calculation of this date involves the assumption of a regular 28-day menstrual cycle.

This pretty much means that if you were conceived on Valentine’s Day and all goes to plan, your birthday should be between November 14-31.

I also read somewhere that the most common birthday in the USA is October 5, whereas the least common in the USA is May 22. The first fact translates into a New Year’s Day conception while the second one gives up a mid-August conception.

Nuff’ said.

3 thoughts on “A reason why there are so many November birthdays”

  1. my birthday is in november 14 too
    i know i always wondered, most of people i know have birthday in november!

  2. That least common birthday fact is false from what I’ve read. The least common birthday is February 29th, then December 25 and new year’s day. I think Christmas eve is next. But yeah my birthday is November 22 and it’s so weird lots of people I know have birthdays this week. I know three November 23rd people in my grade and 2 November 24th people personally.

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