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In vitro fertilization (IVF) is now responsible for 1.6% of U.S. births. Two analyses provide additional insight into the societal impact of assisted reproductive technology. Using national data from 2012 through 2014, CDC investigators estimated that the proportion of births resulting from IVF increases with maternal age: IVF was used in 76% of the 2020 births to women 50 or older versus 4% of some 1.5 million births among those aged 35 to 39. Moreover, frozen oocytes or embryos were used in >70% of IVF births in which women older than 45 provided their own eggs — and in >95% of such births in women 50 or older. Use of gestational carriers also increased with maternal age, accounting for 20% of such births to women 50 or older.
In the secon…