Three-generation IVF usually takes one to two months, including physical examination, ovulation, egg and sperm retrieval, embryo culture, embryo screening and pregnancy test and other steps, and some patients may need a longer period of time, which varies from person to person. 1. Physical examination: Physical examination is a basic step of IVF, which is needed to find out the reasons for not being able to have a normal birth and improve the success rate of IVF to a certain extent. 2. Ovulation: According to the results of the physical examination, the doctor will formulate a specific IVF program. Women who have entered the IVF cycle should start ovulation stimulation, and the choice of program also varies according to their own conditions. 3. Sperm and egg retrieval: After the ovulation promotion, the woman should retrieve the eggs, and the man should also retrieve the sperm. After both parties have retrieved their sperm, fertilization will take place in vitro. 4. Embryo Culturing and Freezing: After in vitro fertilization, the embryos will be cultured for 3 to 5 days and then frozen for transfer. 5. Embryo screening: After the fertilized egg divides, cells need to be extracted for PGD genetic diagnosis, and the final screened healthy embryo will be transferred to the woman’s uterus for implantation, pregnancy, and development into a fetus. 6. Pregnancy test: 14 days after the embryo is transferred, the woman can go to the hospital for pregnancy test to clarify whether her three-generation IVF is successful. The above steps are the process of three-generation IVF, the length of time varies from person to person, usually between one and two months, some patients may need a longer period of time, specific advice to consult the doctor.