If you keep on listening and watching kids shows and music while pregnant then twins and triplets are a lot more likely. But this still doesn't mean that you will have triplets:(
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You can only have triplets.
No u can't
There is a cheat but it does not work, so no you cannot have triplets.
You can have up to 8 sims per household however if you have 7 sims and 1 of them is pregnant with twins or triplets you can have more.
You can only have 8. However, if you have 7, and one of those Sims is pregnant with twins or triplets you can have more.