In some cases, the decrease of oocytes in quantity and quality occurs earlier than expected. Which is known as early menopause. In case the woman wants to fulfill her desire to become a mother. She will need to have her ovarian reserve checked to decide if it is possible postponing her motherhood after the age of 35. When the woman decides to delay this experience for other reasons. The egg freezing is the best alternative to achieve and plan it as soon as she is ready. With this treatment, the chances of having a healthy child increase. Since the eggs preserve their quality and therefore do not age. Female age is the most important factor affecting the ovarian reserve. As the woman ages, there is a lower quantity and quality in her oocytes. Additionally, there are certain factors that can negatively influence the ovarian reserve and female fertility. Which can be the cause of an early menopause or premature ovarian failure. The alterations that can affect the ovarian reserve are: chemotherapy and radiotherapy. Stress. Obesity. Environmental contamination and certain diseases such as endometriosis.