IVF transplantation is generally referred to as IVF transplantation, 40 days fetal size can not be determined, it is recommended that you can go to the hospital to check the size of the fetus at 50 to 60 days of pregnancy. 40 days after a woman undergoes IVF transplantation, if the fertilized egg is implanted, at this time, the gestational sac has just been formed, and the buds and the specific form of the fetus have not yet appeared, so it is impossible to check the size of the fetus. Usually after a woman undergoes IVF transplantation, she can do ultrasound examination 50~60 days after the fertilized egg is deposited, at this time, fetal buds and fetal heartbeat will be seen, and the size of the gestational sac is around 1cm. Usually 40 days after IVF transplantation can not determine the size of the fetus, it is recommended that pregnant women during this period of time to rest more, regularly go to the hospital for maternity checkups, and can not carry out heavy physical labor. In addition, pregnant women need to eat nutritious food, such as milk, eggs, oranges, tomatoes and so on. If there are other problems, it is recommended to consult a professional doctor for guidance.