Measuring the fetal heart to find the position is mainly based on the position of the fetus, so it is important to touch the position of the fetus before measuring the fetal heart. Fetal heart refers to the fetal heartbeat, which can reflect the state of the fetus in the uterus. Under normal circumstances, between 12 and 24 weeks of pregnancy, when the fetal position is not fixed, the fetal heart is more difficult to find, in most cases, in the pubic symphysis slightly to the left or slightly to the right position. After 30 weeks of pregnancy, the fetal position will be gradually fixed, if it is cephalic fetal heart is usually in the left lower abdomen or right lower abdomen, if it is transverse fetal heart is usually in the umbilicus or below the umbilicus, if it is breech fetal heart is usually in the navel level left or right position. If the fetal heartbeat is too fast or too slow, it is likely that the fetus is suffering from intrauterine hypoxia, and it is important to go to the hospital in time to find out what is going on.