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.
Income and fertility
Income and fertility is the association between monetary gain on one hand, and the tendency to produce offspring on the other. There is generally an inverse correlation between income and fertility within and between nations. The higher the degree of education and GDP per capita of a human population, subpopulation or social stratum, the fewer children are born in any industrialized country. In a 1974 UN population conference in Bucharest, Karan Singh, a former minister of population in India, illustrated this trend by stating "Development is the best contraceptive." Many countries are experiencing a rather weak correlation with income and fertility rate within a given household. Families with a higher income produce a lower number of children resulting in a low fertility rate whereas families with lower income produce more children with a higher fertility rate. Total fertility rate is specifically the number of children who would be born per woman if she were to pass through the childbearing years bearing children according to a current schedule of age-specific fertility rates. In developing or less developed countries, families need their children for labor and for economic support in the future. Many countries do not have proper pension policies, children are needed in order for the parents to have financial support in their old age.