Ive just bought a baby veiled chameleon and had him for 1 week....so far alls fine and well, feeding ok and looking very fit and well.
My question is that even with my hand in his viv (although he does shy away) he never changes colour like others ive seen do...i know colour change is mostly due to stress so does this mean he's happy?

That could meam he is content or calm. Give him time his colors will eventually change.

Baby veileds don't change color very much yet, at least not like the adults.
What is his normal color and how old is he?

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1.2.1 Ch. (T.) melleri, 1.2 Ch. (T.) jacksonii xantholophus
My work: www.gibbonsrock.com

usually you have to wait over 6 months for colors to change on veileds

He's 12 weeks old and a nice vivid green colour all over, although i can just see where the stripes will come through