I'm getting worried about my 6 mo old boy making these dry hacking sounds lately. It's not quite a cough, but he's been doing it a lot more than I care for. So far it seems like everytime he does it, he's been really thirsty, and giving him water helps, or he would do it when he's spitting up, but I don't know if that's all it is. Could he be getting dust and hairs in his throat? We have a cat, and the place can get pretty dusty. Has anybody's baby had the whooping cough, because he's only had one shot for it, and now I'm starting to get worried!