“Fertility medications can stimulate the ovaries ... Dr. Bibbo agrees, and is adamant that no one should be “trying to have twins" because of the higher risk of complications.

Like any medical treatment, fertility medications may have some side effects ... the overall evidence remains inconclusive. The chance of twins or triplets increases with fertility treatments ...

There are many reasons for this trend, but Bailey believes the main drivers are societal factors such as older pregnancy and increased access to fertility treatments. In the first place ...

Finally, a woman may be more likely to have twins if she's in her late 30s or obese. The odds may also rise if she had a fertility treatment or if twins run in her family. Seeing double yet?