Replacement fertility is the level of fertility that is required to sustain a population without any external additions, Replacement fertility is 2.1 children born per woman in a population.
=== Film documentary Demographic Winter: The decline of the human family ===
=== Film documentary Demographic Winter: The decline of the human family ===
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=== Eric Kaufmann on sub-replacement fertility ===
=== Eric Kaufmann on sub-replacement fertility ===
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[[Eric Kaufmann]] wrote about the problem of sub-fertility in the developed world in his book ''Whither the Child?: Causes and Consequences of Low Fertility''.<ref>[http://sociology.virginia.edu/publications/wilcox-whither-the-child Whither the Child? Causes and Consequences of Low Fertility], University of Virginia, Department of Sociology</ref>
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[[Eric Kaufmann]] wrote about the problem of sub-fertility in the developed world in his book ''Whither the Child?: Causes and Consequences of Low Fertility''.<ref>[http://sociology.virginia.edu/publications/wilcox-whither-the-child Whither the Child? Causes and Consequences of Low Fertility], University of Virginia, Department of Sociology</ref>