On February 14, 2018, 19-year-old Nikolas Jacob Cruz killed 17 and wounded 17 teachers and students at his former school, Marjory Stoneman Douglas High School in Parkland, Florida. Although the aftermath of this mass shooting saw increased debate surrounding gun violence, research on firearm-related injuries in the United States—particularly among individuals younger than 18 years—continues to be limited.¹ This study describes national trends in the incidence of and charges associated with the emergency department (ED) and inpatient management of firearm-related injuries among individuals younger than 18 years.