At just over 2 years my son started toe walking a little bit. We were pretty sure it was just a stage and that he was doing it simply because he had learnt that he could. Just to be on the safe side we took him to a children's podiatrist and she said his feet were fine and suggested boots for a little while to prevent him being able to go up on his toes until he got sick of doing it. Turned out he stopped before we found him boots anyway. He's 2yrs10mths now and he's now discovered that he can walk on his feet with his toes curled completely under his foot. Sort of like a ballerina, but with the toes curled right under. Again, I'm sure it's just a stage. I used to do the exact same thing as a kid and my feet are fine