Researchers investigated whether men or women have fewer children. Using international datasets, they demonstrate that imbalances in population structure, particularly an increasing proportion of men, affect male fertility. While men used to have higher fertility than women globally, this has reversed, and women have and will have a higher fertility rate than men. The scientists offer recommendations to counteract the social implications of this trend.
It’s kind of a trivial observation: the higher the ratio of men to women, the lower the male fertility rate is relative to the female one, since the number of babies born is, of necessity, equal. For more detail, you need to look at relative birth rates and relative mortality rates, both sliced and diced into age cohorts. The scientists also broke it down by geographic regions.