DS2 is 11 mths and is not crawling yet, let alone cruising around the furniture. Most of the other babies his age are walking with walkers and many others are crawling around and are much younger than him. He kind of shuffles around slightly. SHould I be worried? One part of me is in no hurry for him to be moving around as I do enough running around after DS1, but as his first birthday comes up, I'm starting to wonder...