We JUST went through this scare as well. It doesn't sound like he has it. My daughter also has a salty taste. She tends to sweat a lot. She did a recent stint in the hospital to not eating. We found that she has an ASD and right ventricle heart dilation. This was the cause for her sweating. The test isn't painful and is over in about an hour. It never hurts to have them tested.
Thanks for your response! I ended up talking to the ped who said they have no concerns because he passed the newborn screening and I passed the carrier test. He just said sweat is salty and if he sweats a lot then it is ok to be salty.
Sorry to hear bout the heart defect. I can understand that my ODD had open heart surgery at 8 wks to correct a VSD & PFO. Good luck and thanks for responding!