what causes ailing placenta
Restriction of the mother's blood flow through the placenta is the most common cause of placental insufficiency. Any restriction can have a serious effect upon fetal growth and development. Placental damage can cause restriction - damage for example caused by infarction (tissue death) or the separation from the uterine wall (placenta abruption). Spasm or blood clots in the placenta veins also have the same effect.