If you think you're seeing double a lot more often these days, you're not alone. The Centers for Disease Control and Prevention says that the number of twins born each year in the U.S. has more than doubled since 1980, MSNBC.com reports
"The twin birth rate rose 76 percent from 1980 through 2009," the MSNBC article reads. "While 189 out of every 10,000 was a twin delivery in 1980, in 2009, 333 out of 10,000 births involved twins."
The reason behind this surge? According to U.S. officials, as cited in the article, it's due to "both the increased use of infertility treatments and the tendency for women to delay childbirth until they are older."
Among mothers 35 and older, the twin rate rose by almost 100 percent; in mothers 40 and older, the rate skyrocketed by more than 200 percent, the CDC report says.
Health experts note that pregnancies with multiples carry higher risks for complications than a single pregnancy. Twins are more likely to be born earlier and smaller, requiring more hospitalization time.
With the increasing number of multiples being born, check out some of the facts we've compiled about twin pregnancies that you might not know.
Also, some of our mom readers share their real-life stories about being pregnant with twins.
Maria Vega is Fit Pregnancy magazine's copy editor.