The difference between a fetal heart on the left side and on the right side is mainly due to the different position of the fetus, but there is no other major difference. The position of the fetal heart is mainly related to the position of the fetus in the uterine cavity, and the position of the fetal heart may change after the fetus moves in the uterine cavity. Generally, in occipital left anterior position, the fetal heart is on the left side, and in occipital right anterior position, the fetal heart is on the right side. The different position of the fetal heart indicates that the fetus is in a different position in the uterine cavity, and there is no other difference. Fetal heart examination during pregnancy can help to understand the growth and development of the fetus, as long as the fetal heartbeat is around 110-160 beats per minute, no matter the fetal heartbeat is on the left side or the right side, it is normal, no need to be overly obsessed with the position of the fetal heartbeat, pay attention to closely observe the fetal movement and the fetal heart can be.