Day Twenty of Twinipedia:
Fact #20
We have been on a roll here.
We have been spending a lot of time researching what factors influence a woman's chances of having twins, and more specifically fraternal twins since identical twins happen just by sheer chance. This stuff is just to fascinating to us as moms and as twins


Well, heredity is an influencer. If you're a twin or if twins run in your family, you're slightly more likely to have a set yourself. Women who are fraternal twins have a one in 60 chance of bearing twins.
Your race can also predispose you to a higher chance of having twins. Twin are more common than average in African Americans and less common in Hispanics and Asians.

So there are some controllable influencers and there are some "what-you-are-dealt-in-life" influencers behind whether you are more likely to have twins or not.

Source of facts from the great site Baby Center.com -
I looked at the possibilities and reasons why some mothers have twins when I became pregnant with my second set. I have fraternal twins and identical twins both naturally conceived - I'd love to know what the odds are of that?!
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