I have had a baby corn snake for about two months and he's been eating great and is gaining weight steadily, so I've started working on short, 5-10 minute handling sessions once a week (about 3 days after feeding day). But I feel really bad and kind of anxious because even though my snake doesn't constantly try to escape or bite me or anything, I can see him breathing really fast like he's really afraid of me/the situation. I can also see his tongue flicking a lot when I'm holding him, and he moves fairly slowly and scents around as if he's curious to explore, but he does recoil if I move too quickly. Which makes sense, but still.
In his tank he doesn't seem to explore much at all, even though I've provided a lot of silk plants, bark pieces & branches, and paper towel/toilet paper cardboard rolls for coverage to help him feel more hidden and safe. I never see him out at all, just poking his head out of one of his hides sometimes.
Is the super quick breathing a normal thing when starting to handle babies? Does it gradually calm down as they get older and more used to the handling? Is it a sign I'm stressing him out too much? It starts literally as soon as I pull him out, and it doesn't seem to calm down at all during the session.
Sorry for the long message and probably too much info and too many questions! Every other snake I've had was an adult when I got them and already really used to handling from their previous owners, so this is my first time ever hand taming a snake on my own!
It sounds to me like what you have is a typical baby corn snake. They tend to be pretty anxious because they are:
being held by the planet's apex predator whose body is bigger than that baby snake's entire known world right now and if you don't think getting picked up by a giant bigger than your house is scary as heck then I don't know what you tell you.
Consider that what you are doing right now is imposing a light dose of stress on your poor baby snake in order to inoculate them against stress down the road. A scared baby with a gentle and patient handler grows into a calm, friendly, confident adult snake.
Heavy breathing, looking around a lot, and recoiling at sudden movement is all on the "pretty good!" end of the Baby Corn Snake Behavior Spectrum. Signs of stress to watch for are going to be tail-rattling, trying to get out of your hands and away from you, or slight musking. Signs of too much stress would be flailing, emptying their bowels/musk glands, hissing/puffing up, or bluff-striking.
Also he's probably exploring a lot more than you realize. Corn snakes are crepuscular, meaning they're active before dawn and after dusk, so he's probably just up and around when you're not there to observe him. If he's even peeking out that means he feels safe, which means he's happy in his enclosure! A miserable snake will do everything they can to leave the situation or they'll try to get where you can't ever see them.
You're doing amazing! Continue doing as you have been and make sure to end each handling session on a high note. You and your little buddy will be besties before you know it. :)