The success rate of blastocyst transfer is not significantly different from season, so there is no such thing as which month is the best for transfer. In Vitro Fertilization – Embryo Transfer (IVF) refers to the process of removing an egg from a woman’s ovary, fertilizing it with sperm outside the body and culturing it for 3-5 days, and then transferring the embryo, which has developed to the cleavage sphere stage or blastocyst stage, into the uterine cavity to enable it to implant and develop into a fetus, which is commonly referred to as “in vitro fertilization”. The ovulation status and uterine wall of the month of the transfer are used to choose the time of transfer, and the doctor will monitor and confirm the time of ovulation. The time of transfer is usually chosen in the mid-luteal phase, when there is less cervical mucus in the female reproductive tract, which is conducive to the operation of the transfer, and the uterine contractions are significantly reduced, which greatly reduces the chances of the embryo being expelled from the body. It is recommended that couples preparing for pregnancy go to the hospital for a pre-pregnancy eugenics health checkup to assess whether their bodies are suitable for pregnancy; quit smoking and drinking, develop good habits, and don’t stay up late. Moderate exercise to maintain good health, to avoid prolonged exposure to radiation or pollution in the environment, to get out of the toxic and harmful work environment; maintain a happy mood; avoid heavy physical labor. Preparation for pregnancy medication should be under the guidance of the doctor, carefully choose the right medication; women should start taking oral folic acid from 3 months before the planned pregnancy to prevent neural tube defects; if the vaccination should be completed during the preparation for pregnancy, try not to be vaccinated during pregnancy. It is worth noting that the transfer of blastocysts is relatively little affected by seasonality and has a greater correlation with the level of hormones in one’s own organism, as well as the thickness of the endometrium.