Then one day I got to see it happen.
We were at the Giant Bean where my parents were doing Friday evening grocery shopping. My mother made us come with them everywhere and grocery shopping was the pits. Though I did sneak in a couple things I knew wouldn't get approval if I asked and they did ring through the register because my mother was too busy laying stuff out on the belt.
When we came out, my mother had a firm grip on the back of my shirt even though I dutifully had a firm grip on the carriage myself. Mary Elizabeth was held by both my mom and dad.