The New York Times reports that U.S. birth rates were flat in 2012, ending a decline that began in 2007.  The falling birth rate seems to be linked to economic conditions:

In 2011, the Pew Research Center analyzed the fall in fertility by geography and found a strong link between falling fertility and economic malaise: the only state to show a slight increase in fertility between 2008 and 2009 was North Dakota, which had one of the lowest unemployment rates in the country.

Hat tip: Tyler Cowen.