Baby boomer is a term use to describe a person who was born during the Post-World War II baby boom between 1946 and the early 1960s. Following World War II, these countries experienced an unusual spike in birth rates, a phenomenon commonly referred to as the baby boom. The terms "baby boomer" and "baby boom", along with others expressions, are also used in countries with demographics that did not mirror the sustained growth in American families over the same interval.