My frequecy of twins and triplets seems to be waning. I've been playing for several weeks. I had a 'heydey' of about 3 days where my villagers were producing tons of twins and a few sets of triplets. This has drastically fallen off. I've tried making everyone in the village a master parent (hey, I had enough food...) and leaving them in that mode. I have all the fertility tech. I have the fetility fish. I have the GC and even checked him for breeding preference, in case that would help. I've tried feeding people the magic fruit. I'm still not getting many multiple births. I'm getting twins about once every 3 or 4 generations, and triplets even less often than that. Are multiple births totally random?

Thanks in advance for any advice.