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”在去年秋季疫情峰后约6个月达到水平。

He worked for NATO and studied natality.

他西洋公约组织服务，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补偿性上升，当时的出生率明显超过预期。”