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CDC: U.S. birth rate at a 30-year low, fertility plummeting


What these numbers mean for the U.S. population is that the country won't be able to achieve a "viable replacement rate" — the standard for any given generation to replicate its total. The rate is calculated by the CDC by estimating how many children a hypothetical group of 1,000 women have over the course of their lives. Currently, the rate is about 1,765 for every 1,000. The replacement rate is 2,100 per 1,000.