As babies you gotta remember panther chameleons grow from about 1-2 inches long and maybe weighing 2-5 grams to 16-18 inches long and weighing up to 275 grams sometimes more, all in the span of about 12-16 months. They grow extremely fast and need to feed as much as possible until they are about 8-12 months old and then you can slow down to about every other day. Most chams will end up slowing down themselves and then it is easy to tell how much to feed after that. I used to feed my panther 22 small crickets a day until he was 6 months and then it slowed to about 16 mediums. But he ate a little bit on the high side of what most chams eat
Unless you have a female, then you want to slow down at 6 months, and turn temps down around then too. If you aren't breeding.