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.
Macau
The growth of population in Macau mainly relies on immigrants from mainland China and the influx of overseas workers since its birth rate is one of the lowest in the world. According to "The World Factbook", Macau has the fourth highest life expectancy in the world, while its infant mortality rate ranks among the lowest in the world.