A tan Toyota Camry and a big rig were heading southbound when the Toyota turned to the right and struck the front left side of the truck.
The unidentified child is expected to fully recover.
The gunman remains at large, said authorities.
Four local law enforcement officers were taken to area hospitals early Sunday morning after two separate crashes.
A man tried to kidnap an 11-year-old girl and force her into the trunk of his car in the Wilmington area on Wednesday.
A woman and a child were struck by a car in South Los Angeles Thursday night.
Authorities Thursday identified two men who were shot and killed in the unincorporated Rosewood area of Los Angeles County.
Authorities are searching for the driver who hit and killed a bicyclist near Compton Tuesday night.