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    [OC] Updated heatmap of birthday distribution and estimated dates of conception: United States 1994 - 2014
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    [OC] Updated heatmap of birthday distribution and estimated dates of conception: United States 1994 – 2014

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    6 Comments

    1. MissingVanSushi on

      As pointed out to me by some kind Redditors yesterday, estimating conception to birth is calculated using 38 weeks, not 40. I’ve updated my data model accordingly.

      Thank you!

    2. piggledy on

      Looks like people really try to avoid giving birth on July 4th, Christmas Eve/Day and New Year’s Eve/Day.
      9/11 also stands out as being noticably lower than the dates around it, probably more so in the 2002-2014 cohort.

      Valentine’s Day looks like a top pick to induce labor.

    3. hemlockecho on

      Is there a theory for why early April is such a rollercoaster for conception? Above average in April 1-4, less than normal 5-8, then well above average for 9-11.

    4. TediousHippie on

      Does this take into account induced births and c sections? That could be why major holidays see fewer births than otherwise expected.

    5. sometimes_point on

      I have two cousins with Jan 1 as their birthday so I am wondering now if the stats are just different for other countries and americans like to induce labor if it looks like the kid will be born on a holiday.

    6. psumack on

      There are still different numbers of each day in the week in the window. Look at the dips on July 13/20/27.