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A baby boom is a period marked by a significant increase of birth rate. This demographic phenomenon is usually ascribed within certain geographical bounds. People born during this period are often called baby boomers; however, some experts distinguish between those born during such demographic baby booms and those who identify with the overlapping cultural generations. The causes of baby booms involves various fertility factors. The most well-known baby boom occurred immediately after World War II during the Cold War. It was a change of trend that was largely unexpected, because in most countries it occurred in the midst of a period of improving economies and rising living standards.
The baby boom occurred in countries that experienced tremendous damage from the war and were going through dramatic economic hardships. These countries include Germany and Poland. In 1945 when the war ended, a huge amount of veterans returned home and began living as civilians. In order to make this process as smooth as possible in the US, Congress passed the G.I. Bill of Rights. The purpose of the Bill was to encourage home ownership and higher levels of education by charging very low or no interest at all on loans for veterans. Getting settled in with a more comfortable economic position allowed families to have a place to live, be educated, and start having babies. "Now thriving on the American Dream, life was simple, jobs were plentiful, and a record number of babies were born." 
The U.S. birthrate exploded after World War II. From 1945 to 1961, more than 65 million children were born in the United States. At the height of this baby boom, a child was born every seven seconds. Factors that contributed to the baby boom consisted of young couples who started families after putting off marriage during the War, government encouragement of growth of families through the aid of GI benefits, and popular culture that celebrated pregnancy, parenthood, and large families.
The baby boom was the result of couples holding off on having children due to the Great Depression and World War II. Once the baby boom began, the average woman started getting married around the age of 20 instead of 22. Couples were eager to have babies after the war ended because they knew that the world would be a safer place to start a family.
Another leading cause that led to the baby boom was that people were able to afford moving out to the suburbs to raise a family instead of living in the city. Additionally, the cost of living in the suburbs was very low, especially for those returning from the military. This was also the time period where women were encouraged to take on their "roles", meaning that they were encouraged to stay home as a housewife along with being a mother while the husband worked.
The market became a seller's market. Many families were adapting to popular culture changes that included purchasing TVs, opening credit card accounts, and buying mouse ears to wear while watching The Mickey Mouse Club. Overall, the baby boom time period was a blessing but it also had its flaws once economists realized how many children were being born. Concern arose about enough resources being available, especially when those born in the baby boom time period started having kids of their own.
The issues of the baby boom time period are that it could hugely impact the population change and cause social and economic impacts. One economic impact of the baby boom is the concern that when baby boomers get older and retire, the dependency ratio will increase. The Census Bureau estimates that the dependency ratio in the United States will be 65 by 2020 and reach a record-breaking high of 75, the highest it has been since the 1960s and 1970s when those baby boomers were children. The economics of an area or country could benefit from the baby boom: It could increase the demand of housing, transportation, facilities and more for the increasing population. With an increase in population, the demand for food also increased. If a country cannot keep up with a rapidly increasing population, it could cause a food shortage and insufficient health care facilities. Without the sufficient supplies needed for the population, it could cause poor health that could lead to deaths in the population. 
"According to the new UNICEF report, almost 2 billion babies will be born in Africa between 2015 and 2050 and the two main driving forces behind this surge in births and children are continued high fertility rates and rising numbers of women able to have children of their own." 
The HIV/AIDS crisis in Africa has contributed locally to a population boom. Aid money used for contraceptives has been diverted over the past two decades into fighting HIV, which lead the number of babies born far outstripping the deaths from AIDS.
After being in a lull of low birth rates, France experienced a baby boom after 1945. The sense that the population was too small, especially in regard to the more powerful Germany, was a common theme in the early 20th century. Pronatalist policies were proposed in the 1930s and implemented in the 1940s.
In addition, there was steady immigration, especially from former French colonies in North Africa. The population of France grew from 40.5 million in 1946 to nearly 50 million in 1968 and just under 60 million by 1999. The farm population declined sharply, from 35% of the workforce in 1945 to under 5% by 2000. By 2004, France had the second highest birthrate in Europe, behind only Ireland.
- Decreţei: (1967–1989), A baby boom in Romania was caused by a ban on abortion and contraception, consequently, hospitals became overcrowded. From the Chicago Tribune on December 26, 1967, the article stated that a doctor had to beg a woman to have a home birth due to overcrowding at the hospital, "Please stay at home, we have no rooms". The column also stated how "pregnant women were having to share hospitals beds and sickly babies were being put into oxygen tents in groups". The baby boom in Romania caused problems that began affecting the health of its residents. 
The term "baby boom" most often refers to the post–World War II baby boom (1946–1964) when the number of annual births exceeded 2 per 100 women (or approximately 1% of the total population size). There are an estimated 78.3 million Americans who were born during this period. The term is a general demographic and is also applicable to other similar population expansions.
Recent baby boom periods include the following:
- Post–World War I baby boom: (1918–1929)
- Post–World War II baby boom: Years of duration vary, depending on the source.
- Echo Boomers (Millennials): (researchers and commentators use birth years ranging from the early 1980s to the mid 1990s) are the children of the baby boomers, Gen Xers, and a few members of the Silent Generation.
Effects on dependency caused by the Baby boom (1946–1964)Edit
During the Baby boom the U.S. experienced after World War II, the dramatic rise in births lead to a higher dependency ratio, which means that there is a large portion of the population under the age of 15 and over the age of 65 that relies on those in the work force (ages 15-64). The Cohort of this baby boom is expected to once again increase the dependency ratio once the majority is over the age of 65, as these people will no longer be part of the work force.
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- U.S. Census Bureau — Oldest Boomers Turn 60 (2006)
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College enrollments have been on the rise as the baby boomers' children — sometimes known as the "echo boom" generation — come of age. This group, born from 1982 to 1995, is about 80 million strong.
- Colby, Sandra L., and Jennifer M. Ortman. "The baby boom cohort in the United States: 2012 to 2060." Population estimates and projections (2014): 1-16.