Arkansas Children's Hospital (ACH) is a pediatric hospital and a Level I trauma center located in Little Rock, Arkansas. It is the sixth largest in the United States, serving children from birth to age twenty-one. ACH is an affiliate of the University of Arkansas for Medical Sciences and serves as a teaching hospital under the UAMS College of Medicine's Department of Pediatrics. ACH staff consists of more than 500 physicians, 80 residents, and 3,500 support staff members.