I think increased maternal age helps.... (something about, as your body matures it may release more eggs at once to get rid of them before menopause happens)..

And Ive read a few times about the more children you have, the greater chances than eventually it will lead to multiples.. (The multi-partum idea)..

But yea they're not exactly things you can just run out and do... lol

But the clomid might work!

K