Polyhydramnios refers to excessive fluid build up of amniotic fluid. The causes of polyhydramnios are highlighted below: - multiple pregnancy - diabetic mother - gut atresia - antenatal infection - rhesus disease - congenital anomaly of the fetus - kidney failure in fetus Reference: https://www.nhs.uk/conditions/polyhydramnios/ Image via: https://clinicalgate.com/polyhydramnios/