It appears the victim and their family were taken to Hoag Irvine by the driver.
http://www.ocregister.com/articles/boy-741256-irvine-struck.html
I'm not sure on the accuracy of the OC Register story. They say the child was later transferred to Global Chapman hospital and died. That makes no sense because Global Chapman is NOT a trauma center. The KTLA web story says the child was transferred to CHOC which is a pediatric trauma center.
If you ever hit anyone with your car, call 911. Don't transport them to the nearest hospital. That is not always the right place to go. If the medics evaluated the child at the scene, they would have most likely transported this child directly to a trauma center and bypassed Hoag Irvine. This would save precious time.