Fetal cord blood flow can be monitored by color Doppler ultrasound. Umbilical cord blood flow monitoring is usually performed after 30 weeks of pregnancy, and can be instrumented to monitor the placental blood circulation. It is non-invasive, and the application of color Doppler ultrasound to detect the kinetics of fetal umbilical cord blood flow can be used to determine the fetal condition of certain high-risk factors, and can provide a strong basis for the clinical selection of the appropriate timing of termination of pregnancy, etc. If the fetal blood flow is not detected in the uterine cavity, it can be monitored by a color Doppler ultrasound. Umbilical cord blood flow examination is to determine the development of the fetus in the uterine cavity, such as the presence of intrauterine growth retardation or fetal hypoxia in the uterus, whether the pregnant woman has a tendency to develop hypertensive syndrome in pregnancy, etc.. Pregnant women are advised to pay attention to the number of fetal movements, under normal circumstances, 3 to 5 movements per hour. If there is any abnormality in the fetal movement, you should go to the hospital for fetal heart rate monitoring and ultrasound examination in a timely manner.