[ARCHIVED] [GRO] Infants never get Little Babbler quirk

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What is your current game version number? 1.109.207.1020
What expansions, game packs, and stuff packs do you have installed? Every EP except For Rent, Horse Ranch, and Lovestruck. Every GP except Star Wars, Vampires, and My Wedding Stories. Every SP except Spooky, Fitness, Cool Kitchen, Home Chef Hustle, and Crystal Creations. The only kits I have are Simtimates Collection, Desert Luxe, Blooming Rooms, Bust the Dust, and Fashion Street.
Steps: How can we find the bug ourselves? Have your sim give birth to a baby and age them up to an infant. Discover their quirks through gameplay or shift-click on the infant and go to the menu where it shows their quirks and allows you to add or remove them.
What happens when the bug occurs? I tracked the quirks of nearly 300 infants in my game and not a single one had the Little Babbler quirk. Every other quirk was present in at least
What do you expect to see? Given that every infant has 3 quirks, and there are only 18 to pull from, I should be seeing the Little Babbler quirk at least occasionally.
Have you installed any customization with the game, e.g. Custom Content or Mods? Not now. I've removed them.
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure 

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As a little personal project, I tracked the genetics & randomized traits and quirks of 291 sims from birth to young adulthood. Every single trait and quirk showed up in a sim at some point except for Little Babbler. The first 202 sims were tracked on game version 1.107.151.1020 and I did have MCCC and just a few other bug-fixing mods installed. I have all the data in a spreadsheet and not a single infant had the Little Babbler quirk. On that same game version but in a brand new, mod-less save, I had only 34 infants but still no Little Babblers. After those 2 tests, I removed my mods folder from the game, then completely renamed my The Sims 4 folder in the Electronic Arts folder on my computer, updated to the current version, and started up the game so it would make a fresh folder. I repaired the game as well, and then made the save that I am currently playing with. No mods, CC, or any other extra files have been put into my current The Sims 4 folder. I am at infant #55 currently and still none of them have had the Little Babbler trait. Even at only 55 infants in this current save, every quirk has shown up anywhere from 3 to 17 times, with the exception of the Little Babbler quirk which currently still sits at 0 sims total. I know this quirk is in the game because I am able to manually add it to infants if I shift-click on them and go through the cheat menu. It has just never shown up. I never tracked any quirks until I started this "experiment" so I can't say for sure if this only started happening after a certain patch/update. I'm happy to share any extra info, send save files, or do additional tests in my game if needed.