* Pre-eclampsia * Chronic hypertension * Short umbilical cord * Premature rupture of membranes *Prolonged rupture of membranes (>24 hours). * Thrombophilia *Polyhydramnios * Multiparity * Multiple pregnancy * Maternal age: pregnant women who are younger than 20 or older than 35 are at greater risk Risk factors for<unk>  include disease, trauma, history, anatomy, and exposure to substances. The risk of<unk>  increases sixfold after severe maternal trauma. Anatomical risk factors include uncommon uterine anatomy (e.g. bicornuate uterus), uterine synechiae, and leiomyoma. Substances that increase risk of<unk>  include cocaine and tobacco when consumed during pregnancy, especially the third trimester. History of<unk>  or previous Caesarian section increases the risk by a factor of 2.3.
Placental abruption
Chorioamnionitis
Uterine rupture
Placenta praevia
Bloody show
Toxic abortion
Umbilical cord prolapse
Septic abortion