Several thousand primary oocytes formed in the fetus do not survive to puberty.

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During fetal development, a female's ovaries contain approximately 6-7 million primary oocytes. However, by the time of birth, this number reduces to around 1-2 million. At puberty, only about 400,000 primary oocytes remain, and only around 400 of these will ever mature and be released during a woman's reproductive lifespan. The rest degenerate and are reabsorbed by the body.

Several Thousand Primary Oocytes Formed in the Fetus Do Not