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.
Birth rate
In many countries, the steady decline in birth rates over the past decades can be greatly attributed to the significant gains in women's freedoms, such as tackling the phenomenon of forced marriage and child marriage, education for women and increased socioeconomic opportunities. Women of all economic, social, religious and educational persuasions are choosing to have fewer children as they are gaining more control over their own reproductive rights. Apart from more children living into their adult years, women are often more ambitious to take up work, education and living their own lives rather than just a life of reproduction. Birth rates in third world countries have fallen due to the introduction of family planning clinics.