7 month old with wet barky cough.?

My 7 month old has had a wet barky cough for about a week and a half now. At first he had a runny nose so I thought It was from the mucus running down his throat but now he just has a stuffy nose and he's still coughing like that. He doesn't have long coughing spells or anything but he's been waking himself up at night from coughing and sometimes when he does cough he has a hard time swallowing all the phlegm. Anyone have any suggestions as to what this may be? Or how to help it. We've done vics, a cold mist humidifier, and in the bathroom with steam.