"'Guests' can get jobs if they wish to," Baymax said. "A living stipend is provided, though, so it is not necessary. Also, I am unaware of the local labor laws regarding minors, so it would be prudent to research them before inquiring about employment." Because you might be a genius and a super hero, Hiro, but you're still 14.

And Baymax has noticed Hiro's fatigue, considering it to likely be a combination of both factors that Hiro is considering. Thus, as they set off to get Hiro's key exchanged, Baymax rested a hand lightly on Hiro's shoulder, partly to guide him and partly for the contact.