hello, thanks for post, your son has indeed symptoms to think in a viral cause,in this age are common high respiratory diseases, can appear nasal obstruction which causes breath troubles, for this are necessary decongestionant measures, but something important that there are to discard is laryngitis that is common in babies too, if your baby have breathing problems better is to seean professional to determine if it is necessary an cycle of antibiotics or do another exams, meanwhile you are doing right don´t allowing to increase temperature, also must do nasal aspirations, and hydrate a lot.