Under normal circumstances, fetal heart rate monitoring starts at 32-34 weeks of pregnancy, and can be done as early as 28-30 weeks of pregnancy if there is any abnormality during pregnancy. Fetal heart rate monitoring is the application of fetal heart rate electronic monitor, to record the fetal heart rate curve, contraction pressure waveforms, etc., to be able to assess whether the fetus in the uterus is normal or not. After the pregnancy to do a good job of pregnancy obstetrical examination, usually all stages of pregnancy obstetrical examination is normal, such pregnant women can start to do fetal heart monitoring in the 32-34 weeks of pregnancy. For people with high-risk pregnancies, such as those with gestational diabetes mellitus, gestational hypertension, gestational thyroid dysfunction and other diseases, start fetal heart monitoring at 28-30 weeks of pregnancy. Weekly fetal heart monitoring after 36 weeks of pregnancy can timely detect the presence of intrauterine distress or other dangerous conditions of the fetus, and any abnormality timely go to the hospital for treatment.