It's clear to say by there that Gus been on his little mind for quite some time now. Not only he doesn't seems to mind to be outside home with his diapers in plain view, but not even bothering about the toddler harness around his chest. Is that a drool on his mouth? It seems quite common there.
The important is that he's happy and curious as a little toddler should be. He's looking at a snail! maybe the first one since his regression.
thanks for the picture. sry for taking too long to post it xD