Some studies have suggested that frozen embryo transfers may have a higher success rate than fresh embryo transfers, but it is uncertain which success rate is higher for individuals. Fresh embryo transfers can save some of the cost of freezing and thawing embryos and can achieve a pregnancy in a shorter period of time. Although the probability of success is lower than that of frozen embryo transfer, it is generally recommended that fresh embryo transfer be prioritized. It is usually the case that a woman’s uterus is adjusted to its optimal condition before transferring the embryos, which can improve the success rate of the transfer. Frozen embryo transfer is generally recommended for infertile couples who need to have their embryos genetically examined before transfer. Either type of transfer should be done in a regular hospital and under a doctor’s supervision.