For anything more than a light bump on the head, first you should call your child's doctor. Observe the child closely for four to six hours after the injury, If the child develops any other symptoms, a CT scan could be done at that time, If your child is alert and responds to you, the head injury is mild and usually no tests or X-rays are needed.
Next Steps
Apply a cold compress for 20 minutes to help the swelling go down.