In two of my games I've been trying to get my peeps to make babies for some time. One family had three kids already and the other four, but I like to see a full house. I had doctor's consultations after the couples failed three times in a row, but there was no recommendation of Baby Boost.

I just tried again and the couple with four kids got twins. I then switched to the other slot, and they had twins, too! I'd only once had twins before, in my very first game.