To have more than one baby at a time on Sims 3, you have to buy the fertility treatment. A lot of people say you have to eat certain things to have triplets on the game, but all I did was buy the fertility treatment, made a baby, and I had a set of female triplets. It's not as confusing as many people say it is.
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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.
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:(
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.