I believe it is normal for a baby cham as well as an adult cham to not eat as much when they shed. My lil dude is about to shed for the first time with me, and he hasn't been eating very much either.
I would purchase one online rather than in PetSmart/Petco. They are usually bigger for less money. LLLReptile has AWESOME customer service as well as cages
Temps for a 3 month old, at the basking spot alone should be no more than 85. 93 in the entire cage is WAY to hot! Humidity needs to come up as well. Temps in your cage should vary from 73-85 (85 being the basking spot). For indoor use, a regular 40/60W house bulb is more than enough. If inside...
I know how you feel about wanting to sit and stare at him and take pictures lol. I think I waited all of ... 30 minutes before I had to take a couple of "1st day pictures". I think the first week in a new place is crucial for them getting comfortable, SO my advice... take some pictures then...