DD is 9 months old and shows ZERO interest in learning to crawl. She just rolls when on her stomach. She does, however, walk assisted, and is trying to pull up on me constantly to walk. Anyone else's LO do this? If so, how long from the time they started this till they walked unassisted? She has zero balance. I'm just trying to figure out how long I have to really clean and babyproof our house.