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Microcephaly (from Neo-Latin microcephalia, from Ancient Greek μικρός mikrós "small" and κεφαλή kephalé "head" [2]) is a medical condition involving a smaller-than-normal head. [3] Microcephaly may be present at birth or it may develop in the first few years of life. [3]
United States birth rate (births per 1000 population). [26] The United States Census Bureau defines the demographic birth boom as between 1946 and 1964 [27] (red). In the years after WWII, the United States, as well as a number of other industrialized countries, experienced an unexpected sudden birth rate jump.
The other aberration from this otherwise steady decline in teen birth rates is the 6% decrease in birth rates for 15- to 19-year-olds between 2008 and 2009. [104] Despite these years of decrease, U.S. teen birth rates are still higher than in other developed nations. [104] Racial differences prevail with teen birth and pregnancy rates as well.
The declining fertility rate became more concerning following the Great Recession between 2007 and 2009, when fertility rates dropped below 2.1 children per woman.
The average size of a completed family 1660–1700 was 7.1 children; the birth rate was 49 babies per year per 1000 people, and the death rate was about 22 deaths per year per 1000 people. About 27 percent of the population comprised men between 16 and 60 years old.
Replacement fertility is the total fertility rate at which women give birth to enough babies to sustain population levels, assuming that mortality rates remain constant and net migration is zero. [8] If replacement level fertility is sustained over a sufficiently long period, each generation will exactly replace itself. [8]
Despite a small increase in 2021, there were fewer babies born last year than there were in 2019, disproving early hypotheses that quarantining might finally lead to a baby boom.
This is a list of U.S. states, federal district, and territories by total fertility rate. Total Fertility Rate by U.S. state in 2021 according to the Center for Disease Control & Prevention Fertility rate by State 2008 - 2020