Vatican City has 4.63 births per 1,000 people per year. The next lowest are Hong Kong (5.43 births), South Korea (5.62), Ukraine (5.75), San Marino (5.92), and Japan (6.65).
There are many reasons why women choose not to have children: a slow economy, dearth of jobs, the costs of raising a child, people choosing to further their careers over a family, older average ages for first-time moms, and the desire to travel and sow one’s wild oats while they are still young.
Governments have given incentives to couples to marry in many forms, i.e. down payment on homes, free childcare, starting motherhood financial packages, baby bonds, free maternity care, free hospital care, and tax deductions per child.
Other countries that face overpopulation with problems such as overcrowding, poverty, and overwhelmed health care, low life expectancy, and low education levels. In such cases the government may pass laws to forbid having more than one child or give incentives to couples to have less children.
Because we have free or inexpensive contraception in the western societies and “planned parenthood” which engages in abortions, the replacement population rate is quite low.
The population replacement level is 2.1 children per family. U.S., U.K., and France have a replacement level of 1.5-1.6 babies per family, below replacement value. Perhaps with all the illegals who come here for birth tourism, the birth rate may be slightly higher than the 1.5-1.6 replacement value. Chad and Somalia have the highest replacement value of 5.9 children per family. Which countries have fertility rates above or below the “replacement level”? | Our World in Data