Just wondering as have some concerns about my ds who is 18mth. He has always been very chesty and as my sister had cystic fibrosis this has always been a concern for me. For both him and my dd, the newborn screening came back fine so I was reassured at the time. However,as months have gone on with ds always having chest problems or wheezing, my mum suggested that I taste his sweat as cf sufferers tend to have salty sweat. Both dh and I did this last night and he definitely tasted salty and now I am wondering if I should request a sweat test from the doctors. Does anyone have any experience of this? Be grateful for some advice to put my mind at ease.