Birth rate
As of 2017, Niger has the highest birth rate in the world with 49.443 per thousand people. 
Japan has one of the lowest birth rates in the world with 8 per thousand people.
While in Japan there are 126 million people and in Niger 21 million, both countries had around 1 million babies born in 2016.
Family planning
Most of the countries with lowest rates of contraceptive use, highest maternal, infant, and child mortality rates, and highest fertility rates are in Africa.
Only about 30% of all women use birth control, although over half of all African women would like to use birth control if it was available to them. The main problems that preventing access to and use of birth control are unavailability, poor health care services, spousal disapproval, religious concerns, and misinformation about the effects of birth control. The most available type of birth control is condoms.
A rapidly growing population coupled with an increase in preventable diseases means countries in Sub-Saharan Africa face an increasingly younger population.