I've noticed that my DS does something similar, but his foot probably only turns about 30-45 degrees. I've also only noticed it when he has shoes on (I think it makes it more obvious), but I have been meaning to have a look and see if he does it without shoes... I've also been wondering whether I should get it checked, but am just keeping an eye on it at this stage.

I wouldn't worry too much about the walking at this stage, they all do it in their own time. If you are worried though, maybe pop in and see your mchn.