[Baymax is thankful that Hiro's agreed to his suggestion, sometimes his patient could be stubborn and often refused to listen to his healthcare advice.

He nods, blinking as he does so. It's easy to agree to the terms Hiro's set, but he doesn't understand why.]

I do not see why I would inform Aunt Cass of the fact that I carried you home.

[It might come out in conversation, but he wouldn't volunteer the information. Hiro is his patient and he will take care of him.]