For a pregnant woman with normal amniotic fluid volume, the amniotic fluid is changed every 3-5 hours. Because the normal amniotic fluid volume is 1000ml-2000ml, the amniotic fluid will be exchanged through the fetal membranes about 400ml every hour, so the amniotic fluid will be replaced every 3-5 hours. The amniotic fluid has the function of protecting the fetus and the mother, protecting the fetus from external stimuli and maintaining a relatively constant intrauterine environment. During labor, it reduces fetal hypoxia. It also reduces the uncomfortable effects of fetal movements on the mother’s body and has the effect of douching the vagina and dilating the uterine opening during labor. During pregnancy, it is important to visit the hospital regularly for pregnancy tests and to keep an eye on the amount of amniotic fluid. If the amniotic fluid is too much or too little, the cause should be identified, and abnormal fetal development should be detected at an early stage. Once premature rupture of the fetal membranes, fetal malformation, preterm labor, fetal distress and other conditions are detected, symptomatic treatment should be actively applied, and depending on the situation, the pregnancy should be terminated to avoid serious adverse consequences such as neonatal asphyxia and death.