Seasonal differences in what mothers ate during pregnancy, and infections occurring at different times of the year could both have an impact on the health of a new-born baby and could influence its life expectancy in older age.

• 母亲在怀孕期间所吃的东西因季节而有不同，一年里不同时间流行的传染病也不一样，两者都会对新生儿的健康发生影响，并进而影响他们到老年时的平均寿命。