4 years ago
My sim had quadruplets.
I was playing the sims 4 and my character went into labor, I am using mods and custom content. I am using mc command center, slice of life and pre teen mod. It also kicked the parents out.
I also had 2 nannies one of them was in a swimsuit. Without mods the mom started glitching too.
What @Idiosyncratic53 said.
MC Command Center has a setting to override household max settings as well, but it's very risky to play with more than 8 Sims because a lot of the in-game stuff isn't meant to handle it (CAS, split household and move, etc.). What I've heard--I haven't tried it but have friends who have, and have watched YouTubers do it--is that split household and move doesn't work at all, and that if you edit them in CAS Sims might just disappear out of your household. You probably want to edit them in MC CAS when they age up. When it comes time to move them out, you probably want to use the shift-click remove from family cheat and then hunt them down in households to put them where you want them to be.
(On the other hand, if you don't want quadruplets, editing the family in CAS might give you twins instead?)
Check those settings and make sure that maximum offspring count and maximum household size are set to what you want them to be.