The exact location of fetal heart sounds auscultation is related to the fetal position and the gestational week. Generally, fetal heart sounds can be heard with a fetal heart auscultator after 16 weeks of gestation. The bottom of the uterus is located below the umbilicus at 16-20 weeks of gestation, so the fetus is located in the lower abdomen, and the fetal heart can be heard by auscultation in the lower abdomen. With the increase of pregnancy month, the fetus grows gradually, you can roughly feel the fetus buttocks, head, back and limbs in the pregnant woman’s abdomen, and then listen to the fetal heart sounds after determining the fetal position by four-step palpation, sometimes you can also hear the sound of umbilical cord blood flow in the fetal limb area, and the rhythm is consistent with the fetal heart sounds. In late pregnancy, the fetus starts to enter the pelvis, and the position of fetal heart sounds varies according to different fetal positions. When the fetus is occipital previa, the heartbeat is heard most clearly when it is below the navel of the pregnant woman; when the fetus is breech previa, the heartbeat is heard most clearly when it is above the navel of the pregnant woman; when the fetus is shoulder previa, the heartbeat is heard most clearly when it is near the navel of the pregnant woman. The fetal heart sounds should be distinguished from the pregnant woman’s heartbeat and intestinal sounds. The fetal heart is a double tone, similar to the ticking sound of a clock.