They were also having their first periods, on average, three months earlier.

她们的首次例假平均也提前三个月。

youdao

But the chimpanzees have territorial fights, and females typically leave their native group before having their first babies.

但是黑猩猩经常会为领土而战，雌性黑猩猩经常在她们产第一个孩子的时候就离开了原来的群体。

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The survey of 3,802 working moms across the country showed that 49.9% of the working moms have had to give up their jobs after having their first baby.

这项针对全国3,802名职业母亲的调查显示，49.9%的职业母亲在有了第1个小孩后，必须放弃工作。

youdao

Thousands of medical students face having their first hospital job offer withdrawn because of marking errors in their exams.

BBC: Junior doctor

But the rest of Britain's Olympians will act as mentors to a squad featuring many having their first taste of international competition.

BBC: SPORT | Other Sport | Davies leads British Euro squad

Some say it could be partly blamed on the fact that many women are choosing to delay having their first child.

BBC: Cancer cases on the rise