Hi I thought I would reply. My daughter has bronchomalcia, part of her airway is not properly formed. She has always coughed for hours on end with even the slightest cold. Often mistaken for asthma or croup the cough of BM is a bit more brassy and tight then the seal bark cough of croup. I recommend seeing a pead resp specialist as most other health prof have barely herd of it before.