He is regurgitating not defecating and you need to find out why. This is a very serious problem and can lead to the quick demise of your snake. To start, I would take a fecal sample or the snake(or both) to the vet and get the feces checked for internal parasites.

Is the entire enclosure 85 degrees or just one side? Does he have 2 identical, tiny hides he can get into? Small, 2-3" clay saucers (sit underneath the pot to catch water) work well for hides as they are dark, heavy and low to the ground. I use the 4" ones for my two corns.

When was the last time he regurgitated? Are you handling him alot? You can handle them 48 hours after they eat, but with baby corns, I would limit handling to a bare minimum until they're eating on a consistent basis. They're easily stressed little snakes(I handle mine once or twice per week).

If they regurgitate, you want to not feed them for 2 weeks after. Limit handling only to what is necessary(cleaning the enclosure). Just change his water and leave him alone. After the 2 weeks is up, you can offer a very tiny, 1-2 day old pink mouse.

I wish you the best of luck with him.