This paper investigates the effect of idiopathic polyhydramnios on the intrapartum and postpartum characteristics of labour and early neonatal outcomes. In this study, intrapartum and early neonatal outcomes of 207 women with idiopathic polyhydramnios and 336 matched healthy pregnant patients were evaluated. In the case of idiopathic polyhydramnios, the active phase of labour became longer when compared to the control group (5.76 +/- 3.56h vs. 4.38 +/- 2.8h, p: 001). The risk of preterm birth (OR 5.23; 95% CI: 2.04-13.42) and caesarean section (OR 2.26; 95% CI: 1.56-3.28) was higher in women with IP. Patients with IP had a higher rate of transcient tachypnoea of the newborn (TTN), newborn resuscitation, admission to neonatal intensive care unit (NICU), ventilator requirement, newborn jaundice, newborn hypoglycaemia and structural anomalies. IP did not cause any appreciable maternal risk during the intrapartum or postpartum periods. However, neonatal morbidity and post-natal anomaly rates were higher in the case of IP.