I wouldn't worry too much until you can see him starting to lose weight. It is also winter and they usually brumate during winter so that could be why. I would just keep attempting to feed every week and he will probably take it eventually. If he still won't eat and he is getting skinnier, then try other methods. Hope this helps

Pinkie Pumps  are a last ditch effort , if  used wrong you can kill your snake in a heartbeat .. They are a brutal meathod  of feeding  I would try force feeding him a mouse tail  or  mouse thigh  if it came to that  .. but if  he looks healthy  and isn'r shriveling away   just  triple  check your husbandry  and  sooner or lare he will eat for you ...

I wouldn't worry to much as long as cage temps and everything are normal. I don't usually brumate my corns but I have a couple that go on hunger strike for a month or so during winter anyhow.They don't usually shed during that time and are less active also. I just keep offering food every week until they take it. If he starts to lose weight and/or act really abnormally then start to worry. If you're really stressed about it you could check the inside of his mouth (Have someone show you how!) to make sure he doesn't have any broken teeth or mouth rot or anything like that.

I think Nix is a bit young to be wanting to brumate. It's not a trait normally seen among such small corns. But as has been said, if he isn't losing weight then you need not worry much.

Just for poops and giggles, have you tried offering up a live pinky?

I don't think he sounds sick at all. My only concern, as stated above, would be that I've never seen a baby refuse because of brumation. However, I only have my animals as a sample size, so who is to say I'm right? I hope he eats for you soon.

What is the temp on the warm size and cool side?  If you don't have a temp gun yet I suggest you get one.  Not sure what your set up is like, but if you're using a heat source, what temp is the tstat set for?

Have you tried braining?

I agree with Nate, while some of my adults decide to eat less during the winter all of my babies go strong through the winter.  Sometimes feeding a live pinky will spark their interest so it might be worth a shot.  Also not sure what if you have a scale, but it might not be a bad idea to get one just to make sure what his weights are at.  But I really wouldn't worry too much unless he starts to lose weight.

Take a needle (or something sharp), put it into the brain of the pinky and stir it around and get some brains out and smear it on the nose of the pinky.  The smell of mice brains can trigger a feeding response in some snakes.  I've had it work on stubborn snakes multiple times, worth a try.

I got six nonfeeding corn babies to take to gerbil pinkies in a heartbeat. They are just hard to come by unless you have your own gerbils. :/ I've had too much frustration with nonfeeding corns. I got one to eat by thawing a frozen pinkie in chicken broth; and another one began to eat when i only offered a pinkie head. I guess the whole pinkie was too intimidating for it? lol ANYWAY~ There are dozens of methods to try, but sometimes just a live mouse is all it takes.

Good luck, and best wishes with Nix! He shouldn't have any internal problems; non-eating corns is an all too common occurence.

Have you tried live? It is always a last ditch effort because I prefere frozen, but most snakes can switch back and forth with little force. I would give it a chance, at least it would be eating even if it is a pain to go buy live every week...

Make sure there's a decent warm area. I know some people manage to keep colubrids without a supplemental heat source but it is so much easier to get decent results if there's a good thermal gradient (basically, one end in the mid 80s, one end in the low 70s or high 60s).

How fast was he moving? When I burmate my kings and garters, they will move but they move *very* slowly, like watching a video that's in slow motion almost.