Arkansas Children's Hospital (ACH) is a pediatric hospital located in Little Rock, Arkansas. It is among the largest pediatric hospitals in the United States, serving children from birth to age 21. The hospital has a staff of over 500 physicians and 80 residents, and is affiliated with the University of Arkansas for Medical Sciences. ACH is a Level I pediatric trauma center and Level IV neonatal intensive care unit. The hospital is also a teaching hospital, providing education and training to medical students, residents, and fellows.