Hi and welcome to cham-mania 
at 3 months I would not recommend supers just yet. The rule of thumb for size if that the insect should not be any longet than the space between the cham's eyes.
why are you feeding every other day? While growing, he should be able to eat as much as he wants, every day. Offer a good variety of food that is dusted supplemented regularly with a Rep-Cal Calcium/D3 (or comparable) and a multivitamin dust (ex: Rep-Cal herptivite)
If you go to the link below you will find the most recommended sites on chameleons. Check out each one and peruse the articles within. You will also find a list of setup questions so feel free to post the Q&A here to make sure he is getting off to a good start. There ARE sites that offer poor and/or outdated info and pet stores and even some breeders do not have the best husbandry info to pass along to new owners. Where did you get him? Would love to see some pics of the guy once he is settled in 
lele
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Chameleon Help & Resource Info
0.1 Veiled Chameleon - Luna
1.0 Beardie - Darwin
0.2 felines - Kyndra and Lita
0.1 African Clawed Frog - Skipper
0.3 Mad. Hissers (2 died ;(
0.1 Chilean Rose Hair Tarantula - Rosa Leigh
0.1 Goliath Bird-Eater Tarantula - Natasha