DS is 3.1 and does a rather amusing fast shuffle when he wants to get somewhere quickly. He can't run yet, although I know kids who are months younger who sprint away from their frantic mothers at some speed.
Now I had thought he was just being lazy and couldn't be arsed running when he didn't need to, but like a fool I have googled and 'normal' age seems to be around 2, so now I am fretting.
Sorry for the two threads.