Once I get actually decide on a locale what kinds of prey can a Panther Chameleon eat at 3mths? Is it only pinhead crickets?
Also, if you worry about neutrition, look up a product called Carnavore Care. It can be mixed with water and fed either directly to your animal, or to the crickets.
pinheads are way too small for a 3 month old. You should get 1/4" -3/8" crickets, baby hornworms, baby silkworms, smal dubia nymphs, small supers......
The rule is no bigger than the space between his eyes so follow that and you should be fine. The exception to that rule is soft bodied feeders like horns or silks but use commons sense and dont try and feed a 3 month old a medium sized hornworm.