Cincinnati, OH, April 14, 2011 -- The number of couples struggling with infertility is on the rise, and these couples often use assisted reproductive technologies, like in vitro fertilization (IVF), to get pregnant. Although IVF can be successful, it can also increase the risk of multiple pregnancies (i.e., twins or triplets), which are often caused by transferring more than one embryo. Twins and triplets are likely to be born prematurely, and, as a result, many have medical complications.