The potential impacts of the U.S. birth rate decline

The U.S. fertility rate is at an all-time low, according to recent data from the Centers for Disease Control and Prevention. Researchers say this is part of a larger downward trend. Since 2007, the number of Americans having babies has dropped 23%, well below the replacement level, meaning not enough are being born to replace those who die. William Brangham discussed more with Brian Mann of NPR.