Fetal heart can be heard by home fetal heart monitor after 12 weeks, and the fetal heart will be clearer when it is heard after 16 weeks. After 6 weeks of pregnancy through the ultrasound can see the fetal buds, fetal heart, after 12 weeks of pregnancy through the home fetal heart monitor can also hear the fetal heart, and so on 16 weeks after going to use the fetal heart monitor, hear the fetal heart will be more clearer. Fetal heart can be heard slightly above the pubic symphysis at 12 weeks of pregnancy, before 18 weeks of pregnancy, the fetal heart sound is mostly heard in the umbilicus or slightly off the right and left, after 18 weeks of pregnancy, the fetal heart sound is clearer in the back of the fetus, its location in the umbilical cord around the pregnant woman, the upper, lower, left, and right side of the opening of the place of the 2 inches. Normal fetal heart rate is 110~160 beats per minute, after pregnancy through the fetal heart rate can understand the development of the fetus in the uterus. Fetal heart rate can be detected by a home use fetal heart rate monitor at 12 weeks, and more clearly after 16 weeks. It is important to have regular checkups during pregnancy, and deal with any abnormalities in a timely manner.