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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]
In a recent study a covariation between human pelvis shape, stature, and head size is reported. It is said that females with a large head possess a birth canal that can better accommodate large-headed neonates. Mothers with large heads usually give birth to neonates with large heads.
Seattle has both the lowest birth rate at 2.6%, as well as the smallest family size at 2.78 people per family. Milwaukee (3.2%) and Boston (3.4%) have the second- and third-lowest birth rates.
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.
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.
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. [102] Despite these years of decrease, U.S. teen birth rates are still higher than in other developed nations. [102] Racial differences prevail with teen birth and pregnancy rates as well.
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
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