Amniotic fluid is usually at its maximum volume around 36 weeks of pregnancy. In normal pregnancy, the amount of amniotic fluid increases gradually with the increase of gestational weeks, at 20 weeks of pregnancy, the amount of amniotic fluid is about 500 ml. At 30 weeks of pregnancy, the amount of amniotic fluid is about 700-800 ml. The amount of amniotic fluid reaches its peak at around 36 weeks, when it is about 1000-1500 ml. After that, the amount of amniotic fluid gradually decreases again, and in full-term pregnancy, the amount of amniotic fluid is usually 800-1000 ml. The amount of amniotic fluid during the whole pregnancy is usually between 300 and 2,000 ml. If the amount exceeds this range, it is called amniosis, and if it does not reach the standard, it is called oligohydramnios. Amniotic fluid is one of the most important indicators of the healthy development of the fetus in the uterus. If abnormal amniotic fluid is detected during the labor and delivery examination, the cause should be found in time and actively treated under the guidance of the doctor.