What are the causes?

Often, no cause can be found for polyhydramnios. However, it can be associated with any of the following: The mother carrying twins (read about giving birth to twins ). The mother having diabetes, including Gestational diabetes (pregnancy-related diabetes). Sometimes, if diabetes is the cause, the baby will be larger than expected for its stage of development. A blockage in part of the baby's gut (a condition called gut atresia), which prevents them absorbing the usual amount of amniotic fluid. A gut atresia would often require an operation after the baby's birth (read more about gut atresia in babies ). The mother having rhesus disease , where antibodies in the mother's blood cross the placenta, sometimes causing anaemiain the foetus. Agrowth of blood vessels on the placenta , called a chorioangioma. A build-up of fluid in specific areas of the baby's body, such as the abdomen and chest cavity, called hydrops fetalis. A genetic problem with the foetus .
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