How Many Do You Know With Jan 1 Birthday?

My friend Patti is a NYD baby.

None, but we have a friend whose b-day is Christmas.

I have a brother-in-law (wife’s brother) that was born on Jan 1.

Coincidentally, his son was also born on Jan 1.

okay, folks, I’m sorry to ruin a fun MPSIMS thread.
But this is the Dope, and I just gotta ask a GQ question here, about statistics: I don’t understand the link, with its list which ranks all 365 days in the year by “popularity” (i.e the number of babies born that day)

Surely, date of birth among a few million people is random, isn’t it?
I can’t understand how any specific date would have more births than the date 24 hours before or the day after.
I can see that it might vary by season (maybe, say, more people having sex on cold winter nights leads to more births the next autumn?*)
And I can see that a few dates would be slightly less common: say, Christmas day-- because hospitals schedule fewer cesarean operations on that day.
But it seems to me that among the millions of babies born over the 25 years listed in the link, in most cases, the number of births nationwide is randomly distributed , and should be identical on most dates.
What am I not understanding?

(* Or vice -versa, I suppose: more people having sex in the summer --after being turned on by seeing sexy bikinis -leads to more births the next spring . Which option applies to you, eh ? :slight_smile: :slight_smile: )

My dog is a rescue, and the vet chose Jan. 1 as her birthday. Along similar lines, my father-in-law had to be dragged into Facebook to receive grandchildren pix, and he took minimal steps to sign up, leaving his birthday listed (falsely) as January 1.