Some of these substances are known to cause developmental delays and learning disabilities later in life. Most problems associated with the placenta have to do with how and where the placenta attaches to the uterine wall. Placenta previa, one of the more common complications occurs when the placenta attaches near the entrance of the cervical canal. As it grows to its final size it can block the entrance to the cervix and the baby's way out. Placenta abruptio is another complication that occurs when a part of the placenta separates from the uterine wall before the birth of the baby.
Complete separation is rare but does result in immediate death of the baby.
This disorder is often linked to high blood pressure and preclampsia, a set of symptoms that include protein in the urine , hyper reflexes, headaches, renal disorders and disturbed vision.