👉 The term "Baby Boom" refers to a period in history when many countries saw significant population growth, particularly in urban areas with high birth rates during the 20th century. It was defined as between 1940 and 1965, often characterized by a surge in births due to medical advancements such as vaccinations, which made newborns more susceptible to diseases. Definition: A term used to describe an era when significant population growth occurred around the world between 1940 and 1965, when many countries saw a rise in births due to the introduction of various health-care innovations like vaccination programs.