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As is often the case after a major war, the end of World War II brought a baby boom to many countries, notably those in Europe, Asia, North America, and Australasia. There is some disagreement as to the precise beginning and ending dates of the post-war baby boom, but the range most commonly accepted is 1946 to 1964. In the United States alone, approximately 76 million babies were born between those years. In 1946, live births in the U.S. surged from 222,721 in January to 233,452 in May. In October, 339,499 babies were born. By the end of the 1940s, about 32 million babies had been born, compared with 24 million in the lean 1930s. In 1954, annual births first topped four million and did not drop below that figure until 1965, when four out of ten Americans were under the age of twenty.^[1]

In May 1951, Sylvia F. Porter, a columnist in the New York Post, used the term "Boom" to refer to the phenomenon of increased births in post war America. She said "Take the 3,548,000 babies born in 1950. Bundle them into a batch, bounce them all over the bountiful land that is America. What do you get? Boom. The biggest, boomiest boom ever known in history." ^[2] The term "Baby Boom" again came to the public's attention in 1980, with the publication of Landon Y. Jones' Great Expectations: America and the Baby Boom Generation.

Contents 1 Causes 2 In the United States 3 In Canada 4 In the United Kingdom 5 European and South-Pacific trends 6 See also 7 Notes

Prior to the Baby Boom, there was a period of approximately 20 years in which having children would have been difficult due to the Great Depression and World War II. The Baby Boom reflected the sudden removal of economic and social pressures that kept people from starting families.^[3] While austerity and restraint were the norms during the stress of the war years, after the war, couples reunited and returned to traditional roles. Returning (mostly male) soldiers re-entered the workforce; many women left wartime work to concentrate on child-bearing and child-rearing. Marriage became again a cultural and career norm for most women — and one result was babies.

The boom continued in the economic glow of the fifties, but dampened its rate as the recession of 1958 sloughed into the following recovery. One theory about the end of the baby boom is that it petered out as the biological capacity of boomer parents took its course. The key biological factor is female fertility. Women are fertile only into their mid-forties. Simple mathematics governs that a woman married in her mid-to-late twenties after the war ended in 1945 would remain fertile for another 20 years or so. The advent of the birth control pill in 1960 in the U.S. also contributed to the slowing birth rate, as earlier contraceptive methods were less popular or reliable.

In the United States, the Arsenal of Democracy significantly increased production of goods and materials for export to war-ravaged Europe. As America supplied the "free world" with goods to rebuild their own economies, the country experienced an unprecedented bubble of vigorous economic growth that did not slow down until 1958. Furthermore, in the U.S. the G.I. Bill enabled record numbers of people to attend college and obtain, perhaps in most cases, the first college degree in their extended families. This led to an increase in education and granted higher incomes to families allowing them the resources to produce more children.

There is little agreement as to the exact beginning and end of the baby boom. In the United States, demographers have put the generation's birth years at 1946 to 1964, despite the fact that the U.S. birthrate (per 1,000 population) began to decline after 1957.

However, although there was an increase in resident population in 1946 and 1947, it produced only a modest increase making up for the loss during World War II. The end of World War II also ended the long depression for the US that started in 1929. By 1948 the US population increase was back to the pre-recession increase rate of about 1.5% per year.

Based on US census information [1]:

• US Involvement in World War II (+ 5 post "boomer" years)

Year	US Resident Population	Net change	Percent change
1941	133,121	1,161	0.88
1942	133,920	799	0.60
1943	134,245	325	0.24
1944	132,885	−1,360	−1.01
1945	132,481	−404	−0.30
1946	140,054	7,573	5.72
1947	143,446	3,392	2.42
1948	146,093	2,647	1.85
1949	148,665	2,572	1.76
1950	151,868	3,203	2.15
10 year average	-	1,991	1.43

The five percent "baby boom" increase of 1946 and the trickle into 1947 barely impacted the US population growth rate between 1900 and 2004.

In Canada, the baby boom is usually defined as the generation born from 1946 to 1966. Canadian soldiers were repatriated later than American servicemen, and Canada's birthrate did not start to rise until 1947. Most Canadian demographers prefer to use the later date of 1966 as the boom's end in that country.

The United Kingdom experienced a second baby boom during the 1960s, with a peak in births in 1964 and a third (smaller) one in the late 1980s. The two peaks can clearly be seen in the UK population pyramids.^[4]

Many European countries, Australia and New Zealand also experienced a baby boom. In some cases, total fertility rate almost doubled. The American birth model, conceived by demographer Frank Notestein, was punctuated by an end to the upsurge in births and a return to pre-war levels. Prior to WWII, fertility rates in Europe and America were on a general decline due to improved nutrition and medicine, and a surge in births were previously not experienced at such a large scale. Based this model, baby boom years for other countries regarded for having a baby boom are as follows:

• France 1946–1974
• United Kingdom 1946–1971
• Finland 1945–1950
• Germany 1955-1967
• Sweden 1946–1952
• Denmark 1946–1950
• Netherlands 1946–1972
• Ireland 1946–1982
• Iceland 1946–1969
• New Zealand 1946–1965
• Australia 1946–1965

In some of these examples, an "echo boom" followed some time after as the large cohort gave rise to another large population of offspring, with a baby "bust" in between. The birth years of the baby boom as noted being both short and long lived, creates what many believe to be a myth to the notion of defining baby boomers as one "generation", as a unified concept is clearly not possible. Indeed, multiple generations may be present in a single country such as Ireland where the boom lasted 36 years. This overlapping effect of generations is not illuminated when considering crude fertility rates. The only common ground for the collective boom is the same approximate starting year. This example can be applied to each state in the United States on an individual basis. The states with a census in place in 1946 saw fertility rates drop to pre-war levels throughout the 1960s, with the average being in 1964.

• Demographics of France
• Baby Boom
• Baby boomers
• 1973 oil crisis