In<unk> , there's abnormalities present within the spiral arties of the uterus, where the terminal part of the spinal arteries does not dilate. This leads to decrease oxygen carried past the maternal villi into the intervillus space. The lack of terminal dilation and inclining blood velocity causes shredding of the villi into the maternal blood, releasing blood coagulants activating the coagulation cascade. Which then leads to blocking of the blood vessels causing<unk>  infarction.
Placental disease
Fetal-maternal haemorrhage
Birth trauma 
Birth trauma
Fetal distress
Birth injury
Placental insufficiency
Uterine malformation