Birth rate
According to the CIA's "The World Factbook", the country with the highest birth rate is Niger at 6.49 children born per woman and the country with the lowest birth rate is Taiwan, at 1.13 children born per woman.
List of countries by natural increase
The birth rates and death rates in columns one and two are the CIA World Factbook estimates for the year 2017 unless otherwise noted, rounded to the nearest tenth (except for Mayotte with 2010 estimates). The natural increase rate in column three is calculated from the rounded values of columns one and two.