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.
Argentines
According to the , Argentina had a population of 40,091,359 inhabitants, of which 1,805,957 or 4.6%, were born abroad. The country has long had one of Latin America's lowest growth rates, estimated in 2008 to be 0.917% annually, with a birth rate of 16.32 live births per 1,000 inhabitants and a mortality rate of 7.54 deaths per 1,000 inhabitants. It also enjoys a comparatively low infant mortality rate. Strikingly, though, its fertility rate is still nearly twice as high (2.3 children per woman) as that in Spain or Italy, despite comparable religiosity figures. The median age is approximately 30 years and life expectancy at birth is 76 years.