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Expectant and Postpartum Moms
Reply to "October Due Dates: Please Join us!"
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[quote=afield]yes, they are dichorionic - 2 sacs. Something like 88-90% are fraternal twins. Which is what makes it pretty high likelihood that they are fraternal. HOWEVER if a zygote divides on the early side of the timing, you get dichoionic identical twins. (It struck me -- if the probability is 1/9 of them being identical, we would all call that pretty low. However, some people would call 1/9 a very "high" probability if the discussion were about some sort of problem.)[/quote]
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