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Wow! I would have thought that having a second set of twins was extremely rare. But when I looked around to find the statistics on that, here's what I found:
"If you have had fraternal twins already, your chance of having another set quadruples. This is because most women who conceive fraternals (without fertility drugs) show a pattern of releasing more than one egg per cycle. If a woman has one set of identicals, her chance of having another set of identical twins is 1 in 70,000 or less."
So if your chances of having fraternal twins averages about 3% (varies by ethnicity and age), would that make your chances of having a second set be as much as 12%?
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