Seeing Double: 1 in 30 Babies Born in US Is a Twin

This article talks about how the number of children born that are twins has increased over the past couple of decades. One of the causes of this increases in twins is the use of fertility treatments. About 12 percent of the women who become pregnant have used fertility treatments. These women that use fertility treatments also have a higher risk of other health issues.

http://www.sciencedaily.com/releases/2012/04/120402144934.htm