Dr. Emory Petrack, director of the pediatric emergency department at Fairview Hospital in Cleveland, Ohio, says when it's a "truly critical emergency, " get to the nearest hospital. (Truly critical emergencies include severe pain, trauma with multiple injuries, and difficulty breathing).

CNN: How to find the best ER for your child

After a head trauma, there may be multiple severe intraparenchymal hematomas.

CNN: Intracranial hematoma