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Chance of having 'natural' triplets: 1 in 8,100 (only about 30% of triplets are 'natural') There has been an increase in multiple births in recent years. Since 1980, infertility treatment has more than doubled the American twin Birth Rate. The rate of triplet or more births is now nearly 5 times higher than before infertility treatment was used.

http://baby2see.com/multiples/multiples.html

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Q: What is the frequency of triplet births?
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