Fetal buds are around 1-2cm after 50 days of IVF transfer, but there may be individual variations. In vitro fertilization-embryo transfer (IVF-ET) is an assisted reproduction technique that should be performed by a medical professional. Generally, fetal buds can appear after 42 days of pregnancy, and thereafter the buds grow by 1-2mm per day. 50 days of gestational week of IVF is equivalent to about 64 days of pregnancy, when the ultrasound suggests that the fetal buds are about 1-2cm. However, there will be individual differences. After successful IVF transplantation, you should pay attention to proper rest, not too tired and strenuous activities, light diet, and follow the doctor’s instructions to continue to give luteal support therapy and take folic acid on time. The ultrasound should be performed at 4~5 weeks after the transplantation to clarify the normal intrauterine pregnancy.