Last year, just over 4 million boys and girls were born in the 50 states. 4,316,233. That's how many babies were born in the United States in 2007, the highest number ever. But after that, the number dropped. Last year, just over 4 million boys and girls were born in the 50 states. The likely reason? The economy, of course. A decline in fertility rates that began in 2008 is closely linked to financial woes that started at the same time, said a new Pew Research Center report issued Wednesday. Changes in personal income, per capita GDP, unemployment rates and...