hi my nine year old son had a cough and flu symptons three months ago and the chesty sounding cough and green phlegm still remains. it did seem to get better but never totally went and has now picked up again...he has only ever had antibiotics once in his live which suggests he his generally fitand well and active...never short of breath or weezy...so why would this be....
Hi, If the symptoms persist that long this suggests the presence of an allergic element. To treat that kind of allergy you can give him an over the counter antihistamines once daily before going to bed. A cough suppressant as dextromethorphan and an expectorant as Murine will help reduce the cough. Make sure he Chat Doctor.  If the green phlegm persists he might require an antibiotic. Hope I have answered your query. Let me know if I can assist you further.