The World’s First Surviving Septuplets – 20 Years Later

Statistics

Data from the last approximately 30 years has shown that the statistical probability of having an identical pair of twins is about 3.5 for every 1,000 birth around the world. Those are some pretty slim odds, but only around 12-18 in 1,000 people are actually twins that were conceived naturally. In the United States alone, twins are born in about 35 out of 1,000 births. Fraternal births increased by around 77 percent thanks to fertility treatments. Fertility treatments may actually boost the chances of a couple having multiple births, just like Bobbi and Kenny McCaughey. Hereditary factors may also play a role in muliple births.