Hi Sweetest Pink, my ds is a cougher as well

He is 8 months and everytime he gets the slightest cold, he has this dry cough that hangs on and on for weeks, even when he seems great otherwise. Is your ds' cough sounding like a dry cough?
Mine has a cold that DH brought home, so ultimately ds got it

He sleeps in our room so I have been keeping a humidifier in there and it has been working wonders! Whether or not your ds is sick, it may help...especially this time of year. My ds was also diagnosed as "asthmatic" meaning he doesn't actually have asthma as of yet, but the Dr. has seem him more than 3 times for wheezing...perhaps you could ask your ds's Dr. to take a look at him if he wheezes as well. Sorry if I wasn't much help, just thought I'd share what I do know about it