At 16 weeks of gestation, the uterine fundus is located between the umbilicus and the umbilicus, and the fetal heart is located in the lower abdomen, between the uterine fundus and the upper edge of the pubic symphysis. Fetal heart auscultation, because of the different weeks of pregnancy, the fetal heart is located in different positions, 16-20 weeks of pregnancy, the fetal heart is located in the lower abdomen, the smaller the gestational weeks the fetal heart is located more down, 21-24 weeks of pregnancy, the fetal heart is generally located between the upper edge of the pubic symphysis and the navel, 28 weeks of pregnancy, the fetal heart is often located in the umbilicus around the position of the fetus is different, the fetal heart position varies. Normal fetal heart in 110-160 times / min, horseshoe sound, often the smaller the gestational weeks of fetal heart auscultation of the greater the difficulty, do not recommend that pregnant women at home repeatedly probe the fetal heart, in order to avoid inducing contractions, pregnancy should be a regular hospital maternity checkups, regular monitoring of the fetal heart, if there is any discomfort, hospital in time to see a doctor.