Fetuses are fed on amniotic fluid, which is the main route of amniotic fluid absorption. Amniotic fluid is the internal environment for the growth and development of the fetus, which can play a role in protecting the fetus and the mother. Amniotic fluid mainly comes from fetal urine, alveolar fluid secreted by fetal lungs, etc. The main way of amniotic fluid absorption is that the fetus swallows amniotic fluid, and the placenta can also be utilized for the exchange of fluids between the mother and child to maintain the relative balance of amniotic fluid volume. Amniotic fluid volume will gradually increase during pregnancy, about 1000ml at 38 weeks of gestation, and about 800ml at 40 weeks of gestation. amniotic fluid is colorless and transparent liquid in early pregnancy, and can be slightly turbid and opaque at full term due to the presence of fetal lipids, epithelial cells shed by the fetus, and hairs in the amniotic fluid. When premature rupture of membranes occurs in late pregnancy, it is necessary to go to the hospital in time. During pregnancy, you should pay attention to rest more, at the same time, you should relax, avoid tension, anxiety, any discomfort should go to the hospital in a timely manner, by the doctor to clarify the diagnosis, and cooperate with the doctor to deal with the symptoms.