How many ova does a woman have?

Answer 1

When a female is born, her ovaries already contain all the ova she will ever produce. The ovaries of a newborn baby girl contain about 400,000 to 1 million immature ova each surrounded by it's own follicle (each ovum is enclosed in a layer of cells called the ovarian follicle). Between birth and puberty, the number of immature ova decreases. So by the time a girl hits puberty, she will have about 50,000 immature ova. Using one ova per month between puberty and menopause, a woman only uses about 400 to 500 ova.

Source:

Complexities of Women; Nancy J Kenney et al, 1996. University of Washington. Pages 5 and 6.