J.Y.
I just went through almost the exact thing with my 6 year old. Last month he also had bronchitis and when I took him ot the Dr. he started talking asthma. However, he also said he did not want ot say the "A" word until he saw him after he was through the antibiotics. When I took him back 2 weeks later he said his lungs were completely clear. His suggestion was to keep a very close eye on it instead of assuming it is or isn't asthma. He gave us a peak flow meter in which we chart his breathing numbers about everyother day. They have stayed steady so far so it looks good. I was really concerned because I am an asthmatic. However, I was also suspicious because I too had not seen anyother signs except when her was sick. My advice is see the doctor get a second opinion and keep an eye on it. A peak Flow Meter is a great way to stay on top of it without being invasive to teh little ones. Hope that helps :)