: No, you can't usually reason with a 3 year old ;-)

So "explaining to her the importance of seat belts" is like trying to
explain particle physics then. Like I said, strap her in yourself and put a
padlock on it if you have to to prevent her from unbuckling it. Until she's
old enough make the decision herself, there should be no argument. Not
worth losing your child over.
--
ColoradoSkiBum