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In modern society, many women prioritize career development and personal planning, often delaying childbirth. When they are finally ready to welcome a new life, they may find that natural conception is far more difficult than expected. The biological reality of a limited egg supply has become a hidden source of anxiety for more and more families during fertility preparation.
Women are born with a fixed number of eggs
Unlike male sperm, which are regenerated approximately every 72 days, women are born with about 1 to 2 million primordial follicles in their ovaries. Over time, these follicles undergo continuous natural atresia, and only a small fraction will ever mature and ovulate. From puberty to menopause, a woman will ovulate only about 400 to 500 times in her lifetime. By age 37, the number of remaining viable oocytes may drop to around 25,000; by around age 51, when menopause typically occurs, only about 1,000 remain. This non-renewable nature makes age the most critical factor affecting fertility.
What other factors accelerate egg loss besides age
Genetic background can cause some women to experience a faster decline in ovarian reserve. Lifestyle factors also play a significant role: smoking directly damages egg quality, and heavy smokers often enter menopause earlier; a high body mass index can disrupt hormonal balance and reduce the likelihood of natural conception in each cycle. In addition, sexually transmitted infections such as chlamydia or gonorrhea may lead to fallopian tube damage. Hormonal disorders such as polycystic ovary syndrome and endometriosis can interfere with normal ovulation. Women who have undergone cancer treatment are also more likely to experience impaired ovarian function. These combined factors contribute to a noticeable decline in natural fertility after age 35.
Why egg freezing in the U.S. and Mexico has become a popular choice
Because the number of eggs is limited and cannot be regenerated, many women choose egg freezing in the U.S. and Mexico while their ovarian function is still optimal. This allows high-quality eggs to be preserved at a younger age, avoiding the decline in quality associated with aging. Frozen eggs can later be thawed and fertilized with sperm to form embryos, which are then transferred through IVF in the U.S. and Mexico. This process provides greater flexibility in fertility planning, especially for women who are not ready for pregnancy due to career or personal reasons.
When a woman decides to begin her fertility journey, frozen eggs can be directly used in an IVF cycle in the U.S. and Mexico. Doctors first assess post-thaw survival rates, then apply individualized stimulation protocols to develop embryos. To further improve success rates, IVF-PGT can be used to perform genetic screening before embryo transfer, selecting chromosomally normal embryos and significantly reducing the risk of miscarriage. This combination of “freeze eggs first, then proceed with IVF” offers many families greater control and reassurance in their fertility journey.
Having accurate information and taking proactive steps is far more effective than waiting passively. The team founded by Dr. Nathan Zhang, IVF USA, has been engaged in overseas assisted reproduction consulting for more than a decade, providing services such as egg freezing in the U.S., IVF in the U.S., and third-party assisted reproduction. With nearly 20 years of experience in the field, IVF USA has expanded early into the Mexico market based on diverse and personalized reproductive needs, becoming the China representative of Power Fertility Center Mexico POWER Reproductive Center (POWER IVF). Currently, Dr. Nathan Zhang’s services extend beyond the U.S. to IVF and egg freezing in Mexico, as well as IVF and egg freezing in Japan and Thailand, and regions including Taiwan and Hong Kong, helping individuals move forward with greater stability and peace of mind on their fertility journey.