Yet Africa is also starting out, a little late, on a demographic transition that others have already traced: as people get richer, they have fewer children.

但是非洲已经开始——尽管有些晚——其他地方已经经历过的人口转型：当人们越来越富有，他们的孩子就越少。

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Will parents be damaging children if they have one fewer organized activity?

如果父母少安排一次活动，会不会对孩子有害？

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Lead author Julia Heiman said that the first 15 years of a relationship may be emotionally draining for women while they are raising children. As they get older, they have fewer pressures.

报告的主要执笔人茱莉亚·海曼说，婚姻关系最初的15年里，因为要抚育孩子，所以女人在情感方面不太顾及自身的感受，但随着她们年龄的增长，她们承受的生活压力会减少。

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But when women put off having children until their mid-30s, they have fewer children.

FORBES: Warning Bell for Developed Countries: Declining Birth Rates

Anna Cristina d'Addio, an expert on fertility policy at the OECD in Paris, thinks they will probably have fewer children in total than if they had started earlier, even though more of them now give birth in their 40s.

ECONOMIST: Most of the rich world is short of babies

The question is whether they have the same number of children as before but later, or whether they will have fewer overall.

ECONOMIST: Most of the rich world is short of babies