My daughter(3.5yr, 15kg)has been suffering from cold, cough, runny nose since past 2 days. However, my concern is this is been happening since past 2 to 3 months on and off which isn't viral and looks more like an allergy to something could be food or water or air or environment etc that unable to understand. She is been falling sick almost 20 days in a month. What could be the reason. Please help!