What does high fertility mean?

>5 births per woman: Low, medium, and high fertility describes the average number of births to a woman in her lifetime (usually by country, race, or ethnicity). Some people use the numbers <2.5 births for low, 2.5-5 births for medium, and >5 births for high. The fertility rate of american-born women is <2 now, which means they are not having enough babies. Other industrialized western countries have similar problems.