The present invention discloses a novel method of prevention of birth defects, miscarriages and infertility in women. The two therapies, disclosed herein, the hormone normalization therapy and the aromatase inhibitor-hormone normalization therapy, focus on restoring young hormonal levels in women in order to prevent female infertility and miscarriages, guide follicular and oocyte maturation, and promote correct chromosomal segregation in oocytes and early embryos.