Interesting stuff. I always assumed that the babies couldn't learn cup training. I never tried it. Might have to give it a whirl.
actually, mine start eating from a cup when he's 3 months old.
Although it took me a while to train him to do so.
This is how i train him: (no guarantee will work for your baby chams.. but, it seem work for me fine. It does requires a huge amount of patience though)
1. Always make your presence known to him during feeding time.
2. For starters, use clear plastic cup


u say? i know i know... people here always suggest to use opaque cup for feeding.. but read the whole thing first and i hope i can prove to you why it works.
3. tease your baby by putting the clear cup filled with crawling crix in front of his line of sight. If it works, he'll focus his one eye to the cup. while the other eye will look at you.
4. Slowly move the cup so it is directly in front of his line sight of you (so he can focus at the insect and looking at you at the same time).. this will considerably boost your baby chameleon's courage to move forward and hopefully start shooting at the crix.
5. repeat step 1-4 until he get used to the plastic cup. So, when he saw you hold one, he'll automatically come to you.
if the step 5 has become his cognitive behavior then:
6. Instead of holding the cup, put the cup in the enclosure.. wherever you want to put it. Make sure that it is ALWAYS the same spot.
He will learn to come at the same spot every feeding time.. (it helps if you stay true to schedule. Always feed him at the same time and at the same spot).
7. This is where the clear plastic cup becomes a problem... Unfortunately, chameleon is not smart enough to know there is a clear barrier between him and the crix. He will start shooting at the side.
If you don't have the patience and the time to train him,
Some people remedy this problem by changing the cup to an opaque one and put some tiny branch so some crix can climb out (thus attracts your chameleon to investigate)..
Although this is fine.. to me it kind of beat the purpose of cup feeding as the crix still able to escape.
This is how I remedy the situation (if you have the time to do it):
8. everytime he came, he will almost always shoot the side of the cup instead of going to the top.
During feeding time, LET HIM shoot at the side of the cup and FAIL to get the crix. After 2 or 3 futile shots, slowly tilt the cup. so your chameleon can see the top circle rim. He will start going forward and get inside of the cup.. mostly he will hold on to the rim.
If he does that, slowly put the cup to the original position.
Now your chameleon will be on top of the cup and shooting away.
Repeat this over and over every time you see him try to shoot at the side of the cup...
It is imperative to let him experience the futile shootings..
After 2 weeks or so, my cham finally gets it...
Now, every 8 am, he's always perch on the cup waiting for me to come and bring him crickets.
He no longer shoot at the side of the clear cup.
Whenever he see the cup, he immediately climb on top while looking at me
as if saying "pour the crix into the bowl please"
This is VERY handy too when i need to take him out for cage cleaning session.
Literally, I just hold a cup with some silkies (i don't put crix for the reason it might jump out of the cup).
He immediately came to me and climb the cup. i just take him out. put him on a spare cage.
and start cleaning his cage.
he is now 4 months old.
hope that helps..