Professor Wang Haibin from the Plastic Surgery Department of Guangdong Second People's Hospital explained that it is generally believed that abnormal events in early pregnancy, such as viral infections, medication, mental stimulation, etc., or exposure to radiation, environmental pollution, etc., can cause microtia. . However, current research shows that no one factor can play a dominant role. For example, the recurrence rate among relatives is only 5%, which means that it is basically not inherited. Current research shows that microtia is a sporadic and random event. Parents must understand that this deformity is not necessarily caused by some reasons before or during pregnancy, and there is no need to worry too much.