Hello and thanks for the query
Usually the head injury
patient are observered for 24 hours after the injury for vomiting
, ENT bleed and drowsiness
or loss of consciousnesses. If nothing happens than patient is alright.
As you have explained the injury is one week old so I don't think you have to be worried for head injury.
Now for rest of the injuries if they are present usually heal in one week unless their is fracture
. I don't thing it is their. So overall nothing to be worried about your son. Consult your doctor if you feel anything abnormal.