The main purpose of 39 weeks of pregnancy is to monitor the fetal heart rate and observe the condition of fetal movement to determine whether the fetus has hypoxia. Under normal circumstances, the fetal heart rate should be between 120 and 160 beats per minute, if it is lower than 120 or more than 160, it is abnormal, which is considered to be caused by intrauterine ischemia and hypoxia of the fetus, and it is necessary to do ultrasound examination in time. The normal fetal movement can also be determined by the number of fetal movements, which should be 4-6 times per hour. If the number of fetal movements is too frequent, more than 6 times, it is considered intrauterine ischemia and hypoxia of the fetus. If it is determined that the fetus has intrauterine ischemia and hypoxia, the pregnant woman should be given oxygen to improve it in time to avoid prolonged ischemia and hypoxia to affect the growth of the fetus.