Thank you for your query.
I understand your concern.Your child is suffering from sinusitis
Take an Xray of the sinuses
. Your child needs nasal decongestants,antihistaminics and vapour inhalation along with the antibiotics.
Consult your ENT doctor if the problem persists.
If you have any further queries you are free to consult me.
Hope this answers your query.
Wishing a speedy recovery.
Have a nice day.