He did it.

It's hard to believe, but Ian is has finally made the transition to going on the toilet. We're not totally there yet, but this weekend - we decided 'it was time' and Ian has done wonderfully thus far. No #2 yet, but we're not going back to pull-ups... so hopefully the next part will be as easy as #1. He's going on the toilet now when he needs to - it's pretty amazing and smooth transition. It's a great feeling for everyone!