If it really is that young, it wouldn't have gone through its first shed cycle. Most folks will tell you they don't even offer food until after their first shed.

The most common reason why a snake regurgs is because of husbandry. What's your temperatures on both sides look like, humidity, do you have a hot spot, are your heating devices controlled by thermostats?

Just looking at the pictures of the enclosures I'd suggest getting fake plants to make the snake feel more secure, but that is secondary to making sure your husbandry is spot-on.