I agree with everyone--it may be the easiest way to explain it to a child, but at the same time you should definitely gently talk to him about the correct terminology, etc. Also, it's great to hear that you're getting out and swimming and stuff. Don't be worried about people seeing it...most people will probably not even think twice or realize what they're looking at.
Stephanie, 28 years old
Diagnosed with Crohn's Colitis March 2000
Possible diagnosis of IBS-D
Tried Meds: Asacol, Remicade, 6mp, Humira, Xifaxan, Apriso, Imuran, Rowasa Enemas, Colocort Enemas.
Tried Probiotics: Align (with no change except bloating) and VSL #3 DS (AWFUL diarrhea).
Currently on: 40mg Prednisone (Been on it since June '09...get me off!!), Psyllium Seed Powder, Prenatal Vitamin, Vitamin B 12 Complex, Vitamin D, Calcium, Vesicare (for urinary retention).