The chance of brain damage caused by third-degree amniotic fluid contamination varies from person to person, depending on the time of discovery and whether timely treatment is provided. Third-degree contamination of amniotic fluid means that the amniotic fluid is in the form of brownish-green paste, which will contaminate the fetal membranes, umbilical cord and placenta, and even be inhaled into the respiratory tract by the fetus, resulting in hypoxia of the fetus, discomfort of the mother, and other symptoms, which may have a certain impact on the mother and child. The incidence of fetal brain damage in third-degree amniotic fluid contamination is related to how early it is detected and whether it is treated in time. If it is detected early and treated in a timely manner, the chance of brain damage is usually small. If it is detected late and not treated in a timely manner, it represents a long period of oxygen deprivation, which will have a greater chance of brain damage. Once found amniotic fluid third-degree contamination, should promptly seek medical treatment under the guidance of the doctor. At the same time, pregnant women should always pay attention to whether there are abnormal fetal movement and other symptoms during pregnancy, so as to facilitate early detection and timely medical treatment.