The so-called frozen embryo is a method of preserving the reproductive function of embryos obtained through in vitro fertilization by storing them in liquid nitrogen at -196℃ for a long period of time. The specific method is that after the doctor determines that the patient meets the conditions for IVF, the number of mature eggs is increased with the stimulation of ovulation stimulating drugs, and under normal circumstances, 8-12 eggs can be collected each time, and then the better quality eggs are selected for in-vitro fertilization, and finally three to five high-quality embryos are cultivated for transfer. In practice, however, not all embryos can be placed in the mother’s body to produce life. The Ministry of Health’s Administrative Measures on Assisted Human Reproductive Technology clearly stipulates that women under 35 years of age may not have more than two embryos transferred for the first time, while women over 35 years of age or those undergoing a second transfer may have up to three embryos transferred for the second time. Therefore, only 1-3 embryos will be transferred back to the uterine cavity in each IVF treatment, and the embryos that are not transferred will continue to be kept in liquid nitrogen tanks for cryopreservation and quiet slumber. Only if this treatment cycle is unsuccessful, or if you want to have a second child, the preserved embryos can be transferred back to the mother during a natural ovulation cycle or ovulation induction cycle. Are the babies conceived from these “awakened” embryos as healthy as those conceived normally? Medical practice has proven that after the embryos are “awakened”, as long as the quality is up to par, the resulting babies are just as healthy, although the earlier the thawing, the better the quality of the embryos. When fresh embryos are transferred, the mother’s uterus is not always recovering well from the damaging steps such as egg retrieval, while when frozen embryos are transferred, the mother’s uterus is in a better condition for conception after recovery and rest. However, since the transfer needs to coincide with the woman’s menstrual cycle and the success rate of the transfer decreases with age, fresh embryos are usually cultured and transferred as soon as possible instead of freezing them and waiting. Whether normal people can freeze embryos to have a baby at a later date After the second child policy came into effect, frozen embryos are in demand. Some people are worried that they are too old and their eggs are not of good quality, so is it possible to have a spaced birth using frozen embryos? To undergo IVF, one must meet the medical indications of infertility, and the current national policy does not allow IVF to be performed on women who are healthy and capable of having children, so it is natural that the normal population is unable to have their embryos frozen. Embryo freezing is more suitable for some special groups of people, for example, young infertile female cancer patients, to freeze their oocytes before radiation and chemotherapy to preserve their reproductive function; there are also some women engaged in high-risk occupations are also suitable for egg freezing or embryo freezing, such as X-ray doctors, astronauts and so on. Generally speaking, the main groups of people who are suitable for embryo freezing are as follows: 1. Embryos that can be utilized remaining after embryo transfer in the course of IVF treatment cycle. 2. Mothers who are not suitable for pregnancy due to the uterine environment in the current treatment cycle (e.g. severe ovarian hyperstimulation or poor endometrium, etc.) may also be frozen for temporary implantation, and then thawed at the appropriate time. 3.If there are systemic diseases such as fever, diarrhea, etc. that cannot be implanted in this treatment cycle. 4.Patients who are likely to lose their ovarian function (e.g. to undergo chemotherapy, radiation therapy or resection surgery, etc.) may also choose to freeze embryos to preserve their fertility.