Walking around my property this afternoon, I came across the exact same thing - a baby deer crouched down along the trail, just like your photo. It must have been very young, smaller than a large dog. Very cute. I was almost as startled as the deer - came around the corner and there he was, only a few feet away. I just stood there for a few seconds, then took a step towards him and he jumped up and ran down the trail - pretty fast for a little fellow. No sign of Mama anywhere, but he let out a surprisingly loud squawk (bleat?) as he ran. Don't think I've ever heard a sound like that before. Figured I had already scared him enough, so I didn't try to follow.
Pretty cool. I see lots of deer around here, but never a baby this small by itself at such close range.