The changes also mean many educated women are now childless, it added. One in ten women now aged 50 does not have children. But one out of five women in their 30s and 40s is without children. And the rate is still climbing.

• 研究报告中称，这些变化还表明很多高学历女性目前还没有孩子。在50岁的女性中，十分之一的人没有孩子。但在30岁至40岁的女性中，有五分之一的女性没有孩子，而且这一比例还在继续攀升。