lots of things can contribute to making a young snake stop eating. Give him a few more days of settling in, exploring etc. Don't handle him. Feed him again overnite and resist the urge to peek in til morning.
With new snakes (at any age, but especially young ones) it's a good idea to let them become established eaters in their new surroundings before you handle them much. Many have no problems eating but stress in other, unseen and/or unknown ways. Broth-scenting, wiggling, braining etc. can be good methods to get noneater's to eat; the negative side is you run the risk of getting a snake that wont eat unless it moves, or smells like tuna salad, or has brains smeared everywhere. Your best bet, and jmho, is to leave it alone, let it settle in, and try in five to seven days.