My 8 month old baby has had a persistant cough since he was 61/2 months. Everytime I have taken him to the Drs they have said it's a virus he's struggling to shake off. When I took him back this morning we saw a different Dr and she listened to his chest and said it sounded clear but it still could be asthma (my 3yr old has asthma and she was making the assumption based on that even though she said they don't usually diagnose asthma under 1yr of age). She has given him some antibiotics for an ear infection (he has a cold but we both agree that the cold and the cough are separate things. She has told me to bring him back in a week if the cough is not getting better and she will order a chest x-ray just to check nothing sinister is lurking. Have any MNers had similar experiences and just what could a chest x-ray pick up on?