My son is 4.5 years old and suffers from a cold and coughs very frequently. He coughs continuously when he starts coughing. I need to nebulize him every time. I tried homeopathy for the long term but as soon as the medicine stopped again he started coughing. I don't want to nebulize him again and again. Some doctor are saying he must be having asthma. But I am not satisfied with it. Yes he has week immunity and less haemoglobin around 10 but I don't think asthma.please provide some solution. Any vaccine or anything else. Please advice something