The amniotic fluid at 27 weeks of pregnancy may be caused by idiopathic, gestational diabetes, fetal malformation, etc. It is recommended to improve the diet, control blood sugar, and terminate the pregnancy if there is a clear fetal malformation. 1. idiopathic: 27 weeks pregnant amniotic fluid may be idiopathic, that is, can not find a clear cause, but this general amniotic fluid will not be a lot of asymptomatic observation. 2. gestational diabetes: 27 weeks pregnant amniotic fluid may be suffering from gestational diabetes, fetal blood glucose increases, maternal blood glucose increases caused by increased urination, resulting in amniotic fluid, pregnant women need to diet or insulin to control blood glucose. 3. Fetal malformations: Excessive amniotic fluid at 27 weeks of pregnancy may also be a result of fetal malformations, such as the presence of digestive and respiratory malformations in the fetus, resulting in excessive amniotic fluid. If the fetus has malformations, it is necessary to decide whether to continue the pregnancy or terminate the pregnancy according to the type of malformation. Excessive amniotic fluid at 27 weeks of pregnancy needs to go to the hospital for further examination and treatment by the doctor.