It’s gotten slightly bigger and its colors have changed! It must be close to maturing.
Young dragons are relatively defenseless. They are born with relatively soft scales, which are shed and replaced with harder ones as the hatchling matures. Once a hatchling’s wings grow in, it marks the beginning of maturation. At this point they are often capable of hunting on their own and are usually left alone by their mother.
The seers all said he was born with a special "code," but being a very logical young beast, he never put much stock in it. Sure, his incessant desire to wipe down everything around him was weird, but there had to be a much more scientific explanation for it than destiny! Obsessive compulsive wipeitdownitis, or something. Yeah, that made way more sense.