Are you adding the trait *after* they're pregnant? The trait is designed to be used *before* they get pregnant, I believe.
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Hello
Other ways to help with having multiple births is to have your sim watch the kids channel.
Also having your sims live in a lot with the " On ley line " lot trait can help to have multiple births.
You could also get some mods such as MC Command Center, which you can then allow your game to have a higher chance of twins and triplets when using the "try for baby" interaction. Happy Simming!!!
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Other ways to help with having multiple births is to have your sim watch the kids channel.
Also having your sims live in a lot with the " On ley line " lot trait can help to have multiple births.
http://forums.thesims.com/en_US/discussion/817478/hello-come-and-introduce-yourself
http://tinyurl.com/OneRoomOneWeek
http://tinyurl.com/rosemow
My Showcase thread https://forums.thesims.com/en_US/discussion/948861/rosemow-s-rooms-showcase
http://forums.thesims.com/en_US/discussion/817478/hello-come-and-introduce-yourself
http://tinyurl.com/OneRoomOneWeek
http://tinyurl.com/rosemow
My Showcase thread https://forums.thesims.com/en_US/discussion/948861/rosemow-s-rooms-showcase