I recently got a Jackson's too. He wasn't a baby (about 8 months old) but it is my first cham, so of course every little thing makes me paranoid.
From my experience over the last two months, I can say:
When I got my cham, he ate that first day then went on a hunger strike that lasted well over a week. I finally broke his fasting by putting crickets on the screen right in front of him. The crickets scurrying up the screen really grabbed his attention, whereas crickets just sitting still weren't of any interest. Also, the crickets I was offering him were technically the right size, but he prefers his feeders to be a little smaller. He is also a huge fan of anything that flies, and I had to wage a major battle to catch the box elder bug that flew into his cage before he ate it. He has also come to like silkworms but won't touch hornworms.
He did settle down (I think the move and the new environment was upsetting) and is a good eater now. I still hand-feed (with long tweezers) his first two or three feeders to be sure he is eating something and then free-range the rest.
Here are my recommendations:
- Give your little guy a few days. My Jax is very chill and friendly, but he took a while to get settled.
- Hand feed (or use tweezers) if you can the first one or two feeders. Only give him one at a time and give him time to swallow and lick his chops. I've noticed my guy gets overwhelmed by too many feeder options, so one at a time works better.
- I made a cup feeder out of a soda bottle (there are several "how tos" on the forums here on how to make one) with a bit of screen inside the cup for the crickets to climb. It seems to work moderately well to keep the crickets moving but also contained. My cham will eat out of it.
- Consider buying him some flies - fruit, house, or blue bottle depending on his size. He should love the movement.
- Offer him something new to eat. My cham will eat something new at least once to see if he likes it. For a small guy, you might try half a superworm (should be available at most pet stores), or order him some tasty feeders online.
Jaxes seem to have quirky little personalities, so it might take some work to figure out the best way to trick him into eating and what he prefers. I think they are the best chams though (Disclosure: I am highly biased).
Good luck!