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Key content Polyhydramnios is a common obstetric condition, but its management can often be challenging., Mild polyhydramnios resolves frequently and is not usually associated with adverse perinatal outcomes., There is a higher prevalence of aneuploidy (10-20%) in severe polyhydramnios., Unexplained polyhydramnios has been associated with increased rates of perinatal morbidity and mortality., Learning objectives To gain an overview of the aetiology and investigations for polyhydramnios in singleton pregnancies., To understand the implications of mild and unexplained polyhydramnios for both mother and fetus., To develop an evidence-based approach for managing this condition and provide a surveillance strategy., Ethical issues Can we justify the benefits of early induction in unexplained polyhydramnios in the face of associated risks? [ABSTRACT FROM AUTHOR]