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The replacement fertility rate is 2.1 births per female for most developed countries (in the United Kingdom, for example), but can be as high as 3.5 in undeveloped countries because of higher mortality rates, especially child mortality. [11]
The population replacement rate, which is the fertility rate needed to maintain a society's population size, is 2.1 children per woman. Countries with fertility rates below this number may experience an overall older demographic and a decrease in population size over time.
Fertility rates measure the average number of live births per woman. The "replacement level" is the rate at which population size remains constant from generation to generation; this is crudely defined as 2.1 births per woman.
Out of 237 countries and dependent territories estimated by UN, 105 have fertility rate more than population replacement level of 2.1 births per woman. Replacement fertility is the total fertility rate at which women give birth to enough babies to sustain population levels.
Fertility rates declined in all countries and territories since 1950, with TFR remaining above 2·1—canonically considered replacement-level fertility—in 94 (46·1%) countries and territories in 2021.
The huge majority of the world population – 80% — now live in countries with a fertility rate below 3 children per woman.3 On the other end of the spectrum there are a few countries — home to around 10% of the world population — where women on average have still more than 5 children.
In 2003, the replacement fertility rate was 2.1 births per female for most developed countries (2.1 in the UK, for example), but could be as high as 3.5 in undeveloped countries because of higher mortality rates, especially child mortality. [6]
The new analysis estimates that 46% of countries had a fertility rate below replacement level in 2021. That number will increase to 97% by 2100, meaning the population of almost all...
Declining fertility worldwide – only six countries with fertility rates above replacement level in 2100 The global TFR has more than halved over the past 70 years, from around five children for each female in 1950 to 2.2 children in 2021—with over half of all countries and territories (110 of 204) below the population replacement level of 2 ...
In 2020, the world’s fertility rate stood at 2.3, slightly above the replacement rate of 2.1 births per woman, which allows for one generation to replace itself. This is down more than two times from 4.7 in 1960.