Hi and welcome to the forum! I don't know much about outdoor enclosures but I do know that if you were planning on having a Jacksons chameleon, CA's summer temps would not be suitable for a Jacksons chameleon so you would need an indoor enclosure for the summer. Hopefully some other members who...
I have absolutely no experience with hatchlings but I agree that a vet visit would just apply more stress to the baby. I don’t think a vet could do really anything to help with a hatchling considering how small and vulnerable they are. Just keep an eye on it. (No pun intended) 😂😂