Hey,
Oily, loose stools, diarhea, excessive gas and bloating, frequent coughs, colds. Frequent diagnosis' of pneumonia, brochitis, ect. Allergy like symptoms. And you don't have to have all these. Some have just the lung ones, while others have just the GI ones.
The skin can taste pretty salty, but that can differ in people. In the summertime, if I've been outside, you can see a layer of salt crystals on my arm. It's as salty as a potato chip.
If you suspect Anything, just ask your pediatrician to find someone who will do a sweat test, or genetic testing. It's the only way you can confirm it.
Hope this helped. Best to you,
Christian