Rates of<unk>  ranges from 0.1-0.6% of all pregnancies. This rate has remained stable over time. A recent study estimates 77% of<unk><unk> s occur in singleton pregnancies (where there is only one baby). In twin pregnancies,<unk><unk> s occur more frequently in the second twin to be delivered, with 9% in the first twin and 14% in the second twin.
Umbilical cord prolapse
Placental abruption
Shoulder dystocia
Retained placenta
Persistent cloaca
Neonatal sepsis
Cephalopelvic disproportion
Omphalitis of newborn