This 'natality depression' reached its maximum levels about 6 months after the pandemic peak of the previous autumn.

这种“生育抑郁症”在去年秋季疫情高峰后大6到了最高水平。

He worked for NATO and studied natality.

他为北大西组织服务，研究出生率。

The dip in birth rates in spring of 1919 was followed by 'a compensatory natality increase in late autumn 1919 and early spring 1920, when natality significantly exceeded the expected rates.'

在1919年春季出生率下降之后，“1919年深秋和1920年初春的出生率出现了补偿性上升，当时的出生率明显超过了预期。”