Polyhydramnios may be idiopathic or associated with a variety of fetal disorders. Decreased fetal swallowing or increased fetal urination is often the underlying mechanism for increased amniotic fluid volume (AFV). The most common associated conditions are fetal malformations and/or genetic disorders, maternal diabetes mellitus, multiple gestation, and fetal anemia. Approximately 40% of polyhydramnios is idiopathic. After birth, however, an abnormality is diagnosed in up to 25% of cases consider

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