By contrast, Trump interrupted Hillary Clinton roughly 51 times the first time he debated her.

You didn’t have to keep interrupting him.'"

and “Come on, man.”

Donald, Melania, and Barron Trump in formalwear

So did Trump amend his behavior in the later debates in an effort to take Barron’s advice?

While it sounds childish, it was not applied only to Trump.

Trump speaking at the first 2020 presidential debate

Trump and Biden at the final presidential debate 2020