There isn't really a cheat. It is more of a secret of the game. Sometimes the pregnant sim's mood will effect gender. The best way is to have the pregnant sim watch the kid's channel or listen to children's music on the stereo
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To get twins, you can use the cheat "forcetwins" in the cheat console after your sim is pregnant.
On the Sims 2 if you want your sim to have twins,just type in the cheat boxforcetwinsand when your sim gives birth she will have twins!!|Warning: I think this cheat only works on macs
sometimes, u just get twins but u can have twins if u want to with this cheat (forcetwins)
What you do is when your sim is pregnant and having the baby stay at home and type Ctrl+Shift+c and type in twins or triplets if you want triplets and there you have it you have twins!!!Your Welcomelook me up on youtube as dolia3654
yes. there are two ways your sim can have twins. either naturally or using the boolprop cheat. you enter boolprop testingcheatsenabled true then hold shift on your already pregnant sim then keep on clicking more until you see "force twins" click on this and voila! two little sim babies are on the way:) if this cheat doesn't work then it might be because you don't have the correct expansion packs. when my people first had twins, i had on my computer the sims 2 pets, the sims 2 season and the sims 2 nightlife. so if you have all of those you should be fine.