Americans just don't make babies like they used to. The U.S. birthrate is the lowest in nearly a century, according to a study released last year by the Pew Research Center. It's half the level of the Baby Boom years after World War Ⅱ. American women, on average, are likely to have fewer than two children during their lifetime, which means not enough babies are being born to maintain the current population size. Even among new arrivals, the trend is declining: The birthrate among Mexican immigrants to the U.S. has plummeted 23 percent since 2007.
展开▼
机译：美国人只是不像以前那样生婴儿。皮尤研究中心（Pew Research Center）去年发布的一项研究显示，美国的出生率是近一个世纪以来最低的。这是第二次世界大战后婴儿潮时期的一半。平均而言，美国女性一生中可能只有不到两个孩子，这意味着出生的婴儿不足以维持目前的人口规模。即使是新来者中，这一趋势也在下降：自2007年以来，墨西哥移民到美国的出生率下降了23％。
展开▼
