A fast increase in the creation of a species is called a population explosion. An example of a population explosion occurred when World War II ended, and the human population increased dramatically due to an accelerated birth rate, a rise in life expectancy and a decline in infant deaths.
The decline in infant mortality occurred because of advancements in science and technology that were a partial result of the Industrial Revolution. Improvements in living conditions and quality of life combined with an increase in food production, improved water and sanitation, and enhanced medical technology to increase life expectancy. As a result, the population increased as well.