Just this week, while outside doing doing some chores, I noted that Aidan had really become a bit too big for his trike: He was practically kneeing himself in the face when he pedaled.
We had a 2-wheeler set aside for him but, for some reason, I was pretty sure the back tire was blown out. Guess I should've checked sooner since, when I put some air in it, it held. So on when the training wheels and away went Aidan...