Way sooner than I anticipated, too.
Just a bit ago I was in the kitchen making egg muffins for the week. Todd's joined me on a low carb kick, so these are the perfect breakfast to make - esp. for hectic weekday mornings. Will went into the back yard to play a bit and I told him to stay on the deck since he didn't have shoes on. (It was actually nice outside, so I don't feel bad about him being in his socked feet on the deck.)
I look outside the window to check on him just in time to see him with his pants and underwear around his knees. Peeing into the fresh morning sun. Sigh............apparently it really is nature versus nurture. I think it goes without saying that I haven't taught him how to do that.