Why are so many babies born around 8AM?
blogs.scientificamerican.com
blogs.scientificamerican.com
I've seen similar patters before. I assume the famous "things break on weekends" is because of somethings similar, ex. because there are fewer people to look for and fix small problems before they become bigger and make things fail.
I also never publish websites on Friday, although for some reason most of my clients want to start the weekend knowing that they're done with it and always beg me to do it.
You just want to play safe and make sure if something can go wrong you're ready to deal with it—in this case by having doctors around rather than being 3AM and the hospital is half empty.
Data visualization of the bleeding obvious that anyone who gave it a moment's thought would have been able to guess.
(My kid's due date was 1 May so we were advised to make plans. As it happens we were in a different country when he arrived so didn't have to see this process in action, but the predictions were accurate).
In fact in the developing world (but also in the first world, not so long ago) a child could be registered months or even years after being born, and even the date of birth could be misremembered in the certificate.