Katanya its great things are progressing well. Did his paed say the cough could be related to his respiratory condition? It is very common for CF'ers to have a cough, in fact a cough is encourage, as it helps move the mucus. And definitely loads of exercise. One of the best things we were told was to get them on to a wind instrument (of course thats if they like it). Also when he is in the bath, try using toys that he has to blow into. Things where he can blow bubbles in the water. Its great for helping to open up the lungs. Just thought you may like to give them a go