The fetus has intrauterine hypoxia, intrauterine hypoxia, the fetal heart rate increases to 160 beats/min or more than 160 beats/min; 4, the physical condition of the pregnant woman, if the pregnant woman has fever or intrauterine infection, such as intrauterine infection after premature rupture of fetal membranes, anemia and hyperthyroidism cause the pregnant woman’s heart rate to become faster, while the fetal heart rate increases accordingly.