By Holly Lebowitz Rossi

A new report from the Centers for Disease Control and Prevention found that 1 in every 30 babies born in America in 2009 was a twin, a sharp rise from the 1 in 53 statistic from 1980.  Researchers attribute the rise to two main factors--a rise in the number of assisted reproductive technologies, such as artificial insemination and in vitro fertilization, and women waiting until they are over 30 to start their families, both of which are known to statistically increase the likelihood of twin pregnancies.

Image: Twin babies, via Shutterstock.

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