Excessive amniotic fluid is defined as excessive amniotic fluid when the amniotic fluid exceeds 2,000 ml, and when the depth of amniotic fluid exceeds 8 cm and the index of amniotic fluid exceeds 25 cm under ultrasound examination, it is called excessive amniotic fluid. 1/3 of excessive amniotic fluid is idiopathic excessive amniotic fluid, and the fetus and placenta are normal and there is no problem. 2/3 of excessive amniotic fluid is caused by fetal malformation, which is 2/3 of excessive amniotic fluid. Excess amniotic fluid is due to pathological excess amniotic fluid, which is caused by fetal malformations that may lead to excess amniotic fluid, as well as some comorbidities such as diabetes mellitus, gestational hypertension, and severe anemia that may also lead to excess amniotic fluid. Twin fetuses have single chorionic twin fetuses and problems with the vascular traffic branches between the two fetuses, resulting in a larger fetus and a smaller fetus, which can also lead to excessive amniotic fluid. There is also a condition of placenta and umbilical cord, the placenta is more edematous, and the umbilical cord is a square-shaped cord, it may also lead to excessive amniotic fluid.