By Tom Hoopes, Aleteia - Researchers have found a “big surprise” in world demographics data... Over that time period, the world average of 4.7 children per woman has dropped to 2.4 in 2017... But if you look at it country by country you see a wide disparity... Countries with the fewest children include Poland, South Korea, Bosnia and Herzegovina and Japan. In Taiwan, women average only 1 child. The most fertile countries include several in Africa, as well as Afghanistan, with an average 4-7 children per family.