If he's interested, work with him. If he becomes uninterested, step back. Potty training can be a huge power struggle, but everything I"ve read about it says it's not a power struggle you need to win. My daughter was very interested at 18 months, but then we went on a trip for 2+ weeks and I couldn't keep up with the training- too much time on airplanes and cars where I just couldn't risk an accident. When we got back she wasn't interested at all. At two I felt pressure that she should be potty trained so we worked on it and struggled with it. Finally I just sat her down and told her I know she knows what to do and when to do it and when she's ready we'll do the potty and she can wear panties. Then I stopped talking to her about it. Within a week she came to me and said she wanted to wear panties. It's been clear sailing since then. With my now two year old, some days she's interested and some days she not but I'm just following her lead. She'll be potty trained for good within 6 months I"m sure. Just do what you feel is best for you and him and don't listen to anyone who talks about potty training as early as possible.