ˈbaby boom noun [countable]
an increase in the number of babies born during a particular period, compared to other times – used especially about people born between 1946 and 1964:
the baby boom generation

[TahlilGaran] Dictionary of Contemporary English ▲

baby boom
n. A sudden increase in the birth rate.
The universities were filled to capacity due to the baby boom that followed World War II.

[TahlilGaran] English Idioms Dictionary ▲