L.W.
Sounds too young. I know pediatricians and some parents say otherwise, but at that age they don't really understand and can't hold it yet. They also could really care less if they pee themselves. I have 4 kids. They all went through that phase where they took off their diapers and peed everywhere, and I would ask them if they wanted to use the potty. But I didn't push it at all. I just put the diaper back on and said how yucky it was to pee on the floor. I tried potty training my first son at 18 months and it backfired. He got more and more angry at me wanting him to go. I finally got a clue and stopped trying. When he was 2 I tried again and he was potty trained within a couple months without hassle. I waited until my other kids were 2 as well. My 2nd son was around 3 and so was my daughter when they were completely done. My last son potty trained in one week, no kidding!! Yes, it's a hassle dealing with diapers, but rushing it doesn't help at all and just adds to the stress. Taking off the diaper is only one sign. They should show that they actually care that they are peeing, and where. They should also be able to tell that they have to go, even if they don't make it, knowing they had to go is a big thing.
If you've tried it and he doesn't really seem ready, wait. Some kids do things early. My oldest son walked at 11 months, but the others ranged 13-25 months. Some kids potty train at 18 months, but it's not the norm.