Birth rate
The region of Sub-Saharan Africa has the highest birth rate in the world. As of 2016, Niger, Mali, Uganda, Zambia, and Burundi have the highest birth rates in the world. This is part of the fertility-income paradox, as these countries are very poor, and it may seem counter-intuitive for families there to have so many children. The inverse relationship between income and fertility has been termed a "demographic-economic "paradox"" by the notion that greater means would enable the production of more offspring as suggested by the influential Thomas Malthus.
Developing country
Over the last few decades, global population growth has largely been driven by developing countries, which often have higher birth rates (higher fertility rate) than developed countries. According to the United Nations, family planning can help to slow population growth and decrease poverty in these countries.