Hai, Welcome to Healthcare magic, First of all let me tell you that this is a common respiratory illness found among children. It affects more on those who live in a populated or polluted atmosphere. Your grandson may get such episode for a few years. But it is ideal that you provide proper treatment for such a case to prevent it from advancing. As a homeopath, i would suggest a treatment plan that includes Agraphis Nutan Q with and anti-asthmatic remedy depending on the case detail. This medicine has helped me and many of my patients with frequent attacks of cold. Meanwhile i would suggest you to keep an emergency contact number of a doctor ready. Do provide him the proper surrounding and life style to get rid of the asthma. I hope this has helped solve your query. Wish your grandson good health and speedy recovery Regards.