My 3 month old baby boy is coughing, seems like a little cold because he has extra drool (phlegm). Anyway, this has been since Sunday. He does not have a fever, nor is he cranky, and he is still nursing regularly. I have put a humidifier in the room he sleeps in, and sat with him in a steam filled bathroom to try to "open him up." What else can I do? I hate to hear him cough... and this never happened with my other 2 children.