Hutchlings grow quickly. What was once a saint bernard is now a small horse. Dragonitts are moody creatures, and restless to boot. What used to entertain them will likely be boring and worthless. They begin to seek out new pursuits, and will encourage their bondmates to go adventuring at this time. Even the home-body colorations of the dragons will be investigating new things, using their more useful senses (sight, smell, hearing, touch) to examine things. Dragonitts are insatiably curious, and as such, they're always getting into trouble.
Dragonitts will start to show an inkling as to which type of dragon they'll develop into, showing a preference to earth, water, or air at this time. All young dragons will start to exercise their wings at this time. They will not be able to attain flight until they are almost adults, and they will not be able to carry passengers until their spontaneous mutations into their type has occured.
By this time, a dragonitt should have a place of its own, as there's really no logical way it's going to live in the average house or palace. Their quarters should be large and expansive, as they're going to be quite huge when they're adults.