Id feed him before you go. Burms are good eaters and usually not shy or stressed unless they are in bad shape. He looks very underfed but not unhealthy. Feed that little guy and he will pep up within a couple weeks. At that age he should be 3.5' no problem.
Don't worry about the Sausage Butt.. Mine can go 1-2 months without pooping.. Other times he goes through drinking spells alot and piss's crazy every 2 weeks..
Congrats and Gorgeous boy
Sent from my iPhone using Tapatalk