What most people say here is husbandry at times,depending on the snakes age can be an issue..I was told that babies should be pretty much eating steady,but heard when they hit a certain weight,them going off feed can happen and be normal..how big is he and how much does he way?
i wouldn't worry,I'm sure he is fine. Just make sure all your temps are right.humidity is right etc...make sure he feels secure etc...