birth rate

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The birth rate plunged from the highest in Canada to the lowest.
该省的出生率在加拿大也从第一骤降至最后一名。
Although the overall birth rate in the east is low, highly educated women do not have fewer babies, as in the west.
尽管东部的总体新生儿出生率低，但是和西部一样，受过高等教育的妇女拥有的小孩并不少。
Although the male-like females have an overall lower birth rate than other females, they do still mate and reproduce, maintaining the mimicry in the damselfly population.
尽管这样的类雄性雌性的出生率低于那些普通雌性，它们仍然会交配和生育，在蜻蜓种群中延续这种拟态。

They started something that you may have heard of called The Baby Boom, so the birth rate shot way up and everyone wanted a home.
你们应该听说过那时候开始的,所谓的婴儿潮,出生率激增而且每个人都想要一套房子
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That this is also an argument for increasing the birth rate seems not to occur.
FORBES: Finally, Economists Acknowledge That They're Biased
The decline of marriage is also contributing to the collapse in the birth rate.
ECONOMIST: The decline of Asian marriage

The birth rate in a place is the number of babies born there for every 1000 people during a particular period of time.