Is my bird sick?

[Ringneck noob]

I recently bought a apparently 3month old Indian ringneck. Its a green one. I've been observing it daily and I've noticed that its a quiet bird. It usually sits on a stick for the most part and while it sits it usually ruffles up its feathers giving it a fluffy look. It also moves slow around the cage. Is it sick or is it just adapting to its new environment, or is it just at this age they are scared not really excited to explore. Please any info would help as I am extremely worried thanks

[AJPeter]

Sad that no one replied to your post, hopefully your bird has settled down and is more responsive tell us how you got on.