OMG
Your post is making me impatient.

My 2 1/2 year old still rides his radio flyer tricycle sitting on the back ledge. Don't ask why but I can't seem to rid him of this habit. I just can't wait until I can take him on long rides without a trailer.
It seems that I need to start very short rides with him and his tricycle. Maybe then he will pedal like normal instead of fred flintstone.
Give your boy another good job from us BF posters.