About 1 out of every 30 births (or about 3 percent) are twins. Once you go beyond twins to triplets or quadruplets, the chances drop significantly. About 148 of every 100,000 births (or 0.15 percent) are triplets or more. That said, your chances of pushing a double stroller go up if you’re over 30, have a family history of fraternal twins, are African American, are obese or very tall, or were undergoing fertility treatments.
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