The most part of oocytes die during the fetal period or shortly after birth. ... Once the oocyte reserve has been exhausted, ovarian senescence, driving what is referred to as the menopause in women, rapidly ensues.

Why do oocytes die before puberty?

Pre-pubertal girls do not produce the gonadal hormones that are necessary for the second phase of development, so the many eggs that started to mature will simply wither away.

What happens to the oocytes?

In the fallopian tube, if pregnancy occurs, the ootid is fertilized by a sperm cell. Once this fertilization takes place, the ootid goes through its final stage of maturation and becomes an ovum, a fully mature human egg cell. That's right; the oocyte actually can't complete its full development without fertilization.