Baby boost isn't supposed to help increase the odds of a multiple birth, but now that I'm on 5th, 6th and one that's a 7th gen family and I have more money than I know what to do with I use it all the time. I know I've given two and three shots to some of my peeps, but have only gotten single births 99.9% of the time. One time I got twins though.

At the beginning, when I couldn't afford the shot, one of my Mom's gave birth to triplets with the first pregnancy. Then when they were 3 years old (all red headed girls -- all identical) I opened my game to an adoption and it was a 3 year old boy. So I had 4 three year older's running around in that family. When they were all five years old, I had them try again and she gave birth to --- twin boys!!! Six kids and only two pregnancies!