M.G.
The cough may have not been croup. I have 4 children, two of which have asthma. I would suggest going to the doctor and getting him checked. I am not sure if you possibly changed detergents recently, hand soaps, body soaps or perfumes? Because these things can all trigger coughs like this that are actually a reactive airway disease and not necessarily asthma. Household chemicals often cause these reactions. My oldest son who is almost 9 was hospitalized unable to breathe because of my wonderful MIL and her need to use her items in my home. She is no longer allowed to do that, we only have specific products we allow in our home because our son's lungs were collapsing and every time she comes out here to visit he has to go to the ER, so we have even asked her not to enter our home because she won't comply with simple rules.