Hello As doctor said that your son is having asthma , so I want to explain you that , what is asthma . Airways hyperresponsiveness that is secondary to inflammatory airways disease that results in recurrent or chronic episodes of wheeze, shortness of breath, chest tightness , &/or cough particularly at night or in the early in the morning. This hyperresponsiveness causes bronchoconstriction , hence cough and cold . Usually , dust , mite , fine dusting powder, sudden fall & rise of temperature, pollen molds are predisposing factors of asthma . When such type of case visit my clinic I prescribe them to take monteleukast+ bambuterole tablet (1/2 is sufficient for your son ) one or two in day depending upon the condition of patient . Hot coffee and steam inhalation also provide relief in such cases. When your child will attain 14-15 years age these attacks will subsides. Good luck.