postpartum haemorrhage - 2.5 fold increase over singleton rate to 10% (1)
cord prolapse - often in association with malpresentation - increased 6 fold in twins (to 2.3%) (1)
locked twins - extremely rare - aftercoming head of one twin locked with forthcoming head of the other - usually requires delivery by Caesarean section
twin to twin transfusion - placental anastomoses may give rise to growth discordance or death of one or both twins
antepartum haemorrhage - studies suggest an increased APH in multiple pregnancies but much of the APH is attributed to unknown origin; a few to placental abruption or placenta praevia
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