During IVF, sometimes more than one embryo can be obtained for transfer in a single cycle, when it is possible to freeze and store the excess embryos for the next use. In addition, in people who are at high risk of ovarian hyperstimulation syndrome, whose uterus is not suitable for transfer in the treatment cycle (factors such as poor endometrial blood supply and endometrial polyps) or who have systemic diseases such as fever or diarrhea that prevent transfer in the cycle, it is also recommended to freeze the embryos for resuscitation when the time is right. However, many people wonder whether freezing and thawing embryos will reduce the embryo fertility rate and affect the quality of embryos and the health of the baby. The answer is no. Embryo freezing and recovery technology is very mature and safe, and will not affect the growth and development of embryos. Frozen embryos are embryos obtained from the IVF process placed in liquid nitrogen at -196°C for a long time. Generally speaking, in this low temperature condition, the enzymatic activity is completely inhibited and the cells are in metabolic quiescence, which means that time is stopped for the embryos at this point, so the length of storage time has no effect on the developmental potential and health status of the embryos. Resuscitation means waiting until the right time to use the appropriate rewarming method and rate of warming to thaw the embryos, remove the cryoprotectant from the embryos, and then reassess the embryo viability. However, embryo cryopreservation and resuscitation transfer is closely related to the laboratory environment and operator skills, so it needs to be done in a well-equipped and advanced embryo laboratory with experienced operators to guarantee the success rate of frozen embryo transfer. In conclusion, the embryo freezing and resuscitation process does not affect the health of the baby. Therefore, women should not be afraid that cryopreservation will affect the quality of embryos, but if the doctor recommends frozen embryo transfer, they still need to follow the professional guidance.