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More U.S. Women Having Twins Because of Infertility Treatments
More U.S. women are having twins because of a rise in infertility treatment and aging mothers, according to the U.S. Centers for Disease Control and Prevention. One in every 30 babies born today is a twin, an increase from 1 in 53 in 1980, according to the report. The twin rate doubled among women ages 35 to 39 and tripled among those 40 and over.