[Baymax is pleased that Chihiro returns the hug after a short delay. Hugs had more benefits when they were returned. He gently pats the back of his patient's head to help reassure him.

No words are needed, he's just letting Chihiro know that he's there for him. He'll let his patient set the length of the hug, he's paying attention to his body language and watching for any signs of him being done with hugging.]