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.
Sex-selective abortion
The two most studied nations with high sex ratio and sex-selective abortion are China and India. The CIA estimates a birth sex ratio of 112 for both in recent years. However, The World Bank claims the birth sex ratio for China in 2009 was 120 boys for every 100 girls; while United Nations FPA estimates China's 2011 birth sex ratio to be 118.