There are three main ways to measure the fetal heart, different weeks of pregnancy can choose different measuring equipment for fetal heart monitoring: 1, Doppler fetal cardiograph: usually 12 weeks of pregnancy, the Doppler fetal heart stethoscope can detect the fetal heart sound, the pregnant woman should look for a more comfortable, quiet environment lying down, head slightly elevated, with the probe to find the location of the fetal heart, hear the stable continuous fetal heart sound after monitoring for 1-2 minutes can be; 2, Stethoscope: 18-20 weeks of pregnancy, with a general stethoscope through the abdominal wall of the pregnant woman can hear the fetal heart sounds, with some experience in medical personnel can be used in this way, close to the upper part of the fetal dorsum can be the most clearly hear the fetal heart sounds, if the fetal position for the cephalic position, the fetal heart below the umbilicus of the pregnant woman, if breech, the fetal heart is located in the umbilicus above the position of the fetal position related to the auscultation position; 3, Fetal Heart Monitoring: 32-34 weeks of pregnancy, can go to the hospital once a week to do fetal heart monitoring, can be done every week, can be done once a week. Can go to the hospital once a week to do fetal heart monitoring, each monitoring 20 minutes, fetal heart monitoring has two probes, one placed in the top of the uterus, is the pressure receptor, the main role is to understand the presence of contractions and the intensity of contractions, and the other is placed in the chest or back of the fetus, for fetal heart measurement. Fetal heart sound is double tone, like clock “ticking” sound, under normal circumstances, the fetal heart rate fluctuation between 110-160 beats / min, fetal heart rate can be accelerated 10-20 beats / min. Fetal heart rate monitoring is one of the most important means of reflecting the condition of the fetus in the womb, and you should communicate with your doctor when you find an abnormal fetal heart rate.