So my little guy has a masters in ROLLING across the room. He's doing better on the sitting up thing. And this week (really in the past two days) he's started crawling backwards!! He's figured out that he needs to push up on his arms, but the knees are not in the game yet, so the push-up's just scoot him back. This morning I was in the kitchen for a sec and came back into the living room to find him stuck 1/2 way under the sofa w/ his little legs!! So funny. I guess he's getting Mobile!