Hi,
Does he have any fever? Is there any nasal discharge visible? Any allergic disease like asthma or
allergic rhinitis in family?
Cough that persisted for 6 weeks needs evaluation to find out the cause. Possibilities are asthma, allergic rhinitis with
post nasal drip or rarely, chronic infections like tuberculosis or pertussis.
Chronic sinusitis also can cause this, but its uncommon in infancy and we expect some nasal discharge too.
If I were your treating doctor, after examining him for signs of allergy and chest examination, I would have ordered a
complete blood count, ESR and a chest x ray. This will help to decide whether this is an infective or allergic problem. Infection might respond to a different antibiotic and allergy will respond to nasal decongestants and steroids. Kindly discuss with your
pediatrician. Meanwhile keep him away from dust/smoke and keep the room clean.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Muhammed Aslam T. K., Pediatrician