54 days pregnant with 3mm buds without fetal heart may be a normal phenomenon, first observe a week after the recheck, has not seen the fetal heart to consider the fetal arrest. A 3mm bud on the 54th day of pregnancy is a normal phenomenon, and the buds usually appear on the 40th-50th day of pregnancy, and the fetal heart appears on the 50th-60th day of pregnancy. Some women have longer menstrual cycles, and ovulation occurs at a later time, so the appearance of the fetal heart will also be delayed. Women can temporarily observe for a week, and then go to the hospital to review the ultrasound to see if there is fetal heart development, have not been able to see the development of the fetal heart should be considered to be a fetal arrest, this situation is not normal. Fetal termination may be caused by abnormal development of embryo quality, chromosomal abnormality, maternal viral infection, endocrine disorders, etc. Do not continue the pregnancy after determining the fetal termination, and remove the uterus in time. After pregnancy, do regular pregnancy checkups, and go to the hospital in time to deal with any abnormalities.