Actually, I was recently told by MS that 2 kids under 3 are allowed in a 2 bedroom. She said that rules allow 1 under 3 in the 1 bedroom part, and 1 under 3 in the studio part, so therefore 2 under three in a 2 bedroom.
I'm not trying to start a debate about rules v. what MS says. But her thinking did make sense to me (assuming it was a non-dedicated two bedroom).
Jenny