The amount of normal amniotic fluid varies with the period of gestation. For example, at about 4 months of gestation, the volume of amniotic fluid is about 200 ml; at about 7 months, it is about 1000 ml; in late pregnancy, the volume of amniotic fluid gradually decreases, and by 37 weeks of gestation, the volume of amniotic fluid can be reduced to 800 ml. When the volume of amniotic fluid is less than 300 ml at full term, it is called hypoamniotic fluid. The effect of low amniotic fluid on the fetus: Because the amniotic fluid is the environment for the fetus to grow and develop, it has the function of buffering the external pressure to protect the fetus from shock; it can also prevent the fetus body and amniotic membrane from sticking together, which is conducive to the normal development of the fetus; it also helps dilate the cervix during delivery, clean and lubricate the birth canal. Therefore, too little amniotic fluid is not conducive to the normal development of the fetus and delivery. Most pregnant women with too little amniotic fluid do not experience significant discomfort, so it is usually detected by the doctor during the maternity checkup or ultrasound. However, individual mothers-to-be may feel that the speed of stomach enlargement has slowed down, the feeling of fetal movement is more obvious than before, and sometimes a fetal movement can cause significant abdominal pain. This is caused by the loss of the buffering effect of amniotic fluid and the force of fetal movement directly acting on the local uterine wall to stimulate uterine contraction. During labor and delivery, it is often found that the uterine height and abdominal circumference are significantly smaller than the corresponding number of weeks of menopause, at which time the doctor will often recommend that the pregnant woman undergo an ultrasound to accurately estimate the amount of amniotic fluid. Low amniotic fluid can also be caused by diseases such as hypertension during pregnancy, diabetes, kidney disease and lupus erythematosus. Therefore, for these pregnant women, it is even more important to have an ultrasound every once in a while to detect low amniotic fluid in a timely manner. How to treat low amniotic fluid: The treatment of low amniotic fluid is related to the number of weeks of pregnancy. The method differs from period to period. 1. In mid-pregnancy, low amniotic fluid is often combined with fetal malformations and requires careful examination (such as cord blood or amniotic fluid chromosome examination to rule out chromosomal abnormalities). When the possibility of fetal malformation is ruled out, the fetus can be closely observed in utero and the changes in amniotic fluid volume. 2.If the low amniotic fluid is caused by maternal blood volume deficiency or hypoxia, drinking a lot of water, intravenous fluids and oxygen can indeed play a role. 3.For mothers with hypercoagulability, subcutaneous injection of low molecular heparin or intravenous infusion of low molecular dextrose can be used to make the blood less likely to coagulate and the blood circulation of the placenta more fluid, which facilitates the formation of amniotic fluid. 4, if necessary, you can also use amniotic cavity perfusion therapy, that is, under the guidance of ultrasound with a puncture needle through the abdomen into the amniotic cavity to inject the appropriate amount of saline to improve the condition of too little amniotic fluid. This method is now increasingly recognized and adopted, especially for pregnant women with unexplained low amniotic fluid at an earlier stage, where the fetus is immature and amniotic fluid perfusion can improve the effect of low amniotic fluid on the fetus and maintain normal fetal development in a short period of time. However, a thorough evaluation must be performed before these treatments are carried out, and the treatment must be performed while staying in the hospital and under close monitoring to prevent adverse reactions such as allergic reactions, bleeding tendencies, preterm labor, miscarriage, and infection. 5. If the amniotic fluid is found to be too small in late pregnancy, after excluding fetal abnormalities, the intrauterine condition of the fetus can be evaluated in detail to promote fetal lung maturation; the pregnancy should be terminated as soon as the fetus is mature. The termination of pregnancy can be either vaginal induction of labor or cesarean section, depending on the fetus and maternal status to choose.