The most common and under-appreciated risk of infertility treatments is multiple gestation pregnancies. Women who undergo infertility treatments are much more likely to become pregnant with more than one fetus than women who conceive naturally.

In assisted reproductive technologies (ART), multiple births are largely due to the practice of transferring multiple embryos back into the uterus during in vitro fertilization (IVF). They are preventable by limiting the number of embryos transferred.

When reproductive medicine was in its infancy, many fertility clinics transferred multiple embryos during each cycle, … More