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I think some of the numbers are skewed because of induced births. Hospitals won’t schedule an induced birth on Christmas day, if they can help it.
Ah yeah - I found myself staring at the 2nd half of December a bit puzzled, but you’re absolutely on to it.
are there absolute numbers? it would be interesting to know how big is the deviation.
I would have thought Feb 29 would be an extra-dark level of blue
People party around end of year. Babies get born 9 months later.
People really working hard to have kids on Valentine’s day.
I’m guessing this data is from one hemisphere (the northern?)
My guess is just the US, because of the low birth rate on 4th of July.
Astrology chart