K.S.
K.. as long as he is ok and developing well, dont sweat it. i am a mom of 2 biological and raised 3 step children. my one step daughter did it for some time and so did my 6 year old. i cant answer why they did it but they did. they outgrew it and are now walking fine. i would not pay any attention to it and make no fuss of it and eventually they will realize that every other child walks on their feet and they will too. hope this helps. K.