Multiple Pregnancy | ReproductiveFacts.org
https://www.reproductivefacts.org/news-and-publications/fact-sheets-and-infographics/multiple-pregnancy-and-birth-twins-triplets-and-high-order-multiples/
WEBNaturally, twins occur in about one in 250 pregnancies, triplets in about one in 10,000 pregnancies, and quadruplets in about one in 700,000 pregnancies. The main factor that increases your chances of having a multiple pregnancy is the use of infertility treatment, but there are other factors.
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