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United States birth rate (births per 1000 population). [1] The US Census Bureau defines baby boomers as those born between mid-1946 and mid-1964 (shown in red). [2]The middle of the 20th century was marked by a significant and persistent increase in fertility rates in many countries, especially in the Western world.
China has a low fertility rate compared to the United States. [8] As of 2023, China's median age has exceeded America's [144] and the Chinese population has already begun to decline since 2022. [145] China's number of people over 65 as a share of the population is predicted to exceed that of the United States by around 2035. [146]
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.
However, unlike the first boom, this increase in the number of births is an increase in the number of births not accompanied by an increase in the total fertility rate. The people born during this period are often called "baby boom juniors" (団塊ジュニア, dankai junia, means "the juniors of the generation of nodule").
The total fertility rate of the United States jumped from 2.49 in 1945 to 2.94 in 1946, a rise of 0.45 children therefore beginning the baby boom. It continued to rise throughout the 1940s to reach 3.10 in 1950 with a peak of 3.77 in 1957.
As life expectancies increase and fertility rates decrease, the world’s population will grow older. Projections show that those 65 and older will outnumber children younger than 18 by 2080.
In 2023, the US fertility rate fell another 3% from the year before, to a historic low of about 55 births for every 1,000 females ages 15 to 44, according to final data published Tuesday by the ...
William H. James writing in 2008 gave an increase in coital rates by returning soldiers as a possible cause. He also noted that a fall in the ratio of male births had been recorded in Iran following the Iran–Iraq War, "explained by psychological stress causing pregnant women disproportionately to abort male fetuses". [10]