This video is actually from a few weeks ago, when he just decided that he wants to walk. Yes, he is 15 months old, and yes, he has been crawling for a really, really long time (his worn-out jeans prove it!)
The day had been warm, but when we were out on our walk, the weather turned cold, fortunately we had our jackets with us, just in case! The day after this video was taken, we had more snow on the ground. Hopefully that's the last of it for a while.
Anyway, back to the video. The little guy is scared of cracks, even if the level of the cement doesn't change- he sees the crack, and doesn't want to walk over it. It's kinda funny!