> Fact #1: Since 1960, child deaths have plummeted from 20 million a year to 6 million a year.
About half of this reduction (from 20 - 10 million) is because:
> Fact #2: Since 1960, the fertility rate has fallen by half.
Globally, the population of young people has decreased. Child mortality has decreased, too, but not by a factor of 3.
[1] https://data.worldbank.org/indicator/SP.POP.0014.TO.ZS World Bank reports 0-14 years, rather than 0-5 used for infant mortality.
> Globally, the population of young people has decreased.
The proportion of the population which are young people has decreased but the total population of young people has increased significantly: https://data.worldbank.org/indicator/SP.POP.0014.TO
Older people were also staying alive longer - the death rate no longer offset the birth rate to the same extent as before.
> Fact #1: Since 1960, child deaths have plummeted from 20 million a year to 6 million a year.
About half of this reduction (from 20 - 10 million) is because:
> Fact #2: Since 1960, the fertility rate has fallen by half.
Globally, the population of young people has decreased. Child mortality has decreased, too, but not by a factor of 3.
[1] https://data.worldbank.org/indicator/SP.POP.0014.TO.ZS World Bank reports 0-14 years, rather than 0-5 used for infant mortality.