The sudden decrease in fetal movement may be due to the fetus being in a sleeping state, which is a temporary decrease in fetal movement, or it may be related to the fetus’ lack of oxygen in the womb, which needs to be analyzed on a case-by-case basis. A. Physiological factors The fetus will be quiet when it is in a sleep state, the number of fetal movements is less, generally there is no problem. The pregnant woman can count the fetal movement again at another time, walk more appropriately, eat some sweet food, can promote the fetus wake up activities. The fetal movement is weak and decreases when the fetus has ischemia and hypoxia in the uterus. It is recommended to consult a doctor in time for fetal heart monitoring and ultrasound examination. . Therefore, if fetal movement suddenly decreases, it is recommended that pregnant women change their position or move around for a while before counting fetal movements. If the fetal movement has been relatively low, it is still recommended to seek medical attention and strengthen fetal heart monitoring.