M.C.
My daughter had chicken pox TWICE before she was one! She got it the first time when we were in the hospital for some tests, and the second time she got it from my MIL who had shingles (but didn't know it at the time). The first outbreak was when she was 6 months old, and honestly, it didn't really bother her. She was covered head to foot in blisters, but she never really scratched at them. She ran a low fever for about a week. I used Aveeno baby wash and calamine lotion (upon the Drs advice). The second outbreak was much more mild, only a few blisters on her torso and legs which also didn't seem to bother her too much.
If you see blisters, take him to the Dr, but there isn't too much you can do but wait it out. Good luck!
M.