How to reduce multiple birth odds?

I think I set my MCC to one or two kids simultaneously, but some of my sims still get triplets or quadruplets sometimes. Although less frequent. I don't know if that's the idea but it still gives me multiples, but less so.

I used to have this same problem for some reason but now I barely ever get multiple births for my sims.
I think EA's default settings for twins is 10% chance and for triplets 1% chance or something like that.
I don't know of any other mods other than MCC but I don't think it has a specific solution for this problem. Although, you can click on your pregnant sim and change the number of babies to 1 if you want (you can choose the gender or let it randomize it for you)

You can use MCCC and set the chance of twins to zero.

This annoys me too...it wouldn't be annoying if they weren't identical every single time. I've reduced all of MCCC's settings but sometimes I'm still getting twins or triplets or quads that are identical still and it sucks.

Make sure your home lot doesn't have they ley line trait set to it as this makes multiples extremely common.