Recently someone (not a parent) corrected my child when they said “What?” and said “Do you mean pardon?” (The child didn’t say “what” rudely).
I was always taught that you must only say “Pardon” if you’ve burped or farted. Otherwise “What?” is correct.
Perhaps it would sound better to say “Sorry, what was that?” but I’d really rather my child didn’t say “Pardon” when they mean “what”.
Obviously I didn’t say anything at the time because it wouldn’t have been appropriate and I would have seemed like a loon.
What do you think?