shindy – no I did not see the letter. my post was not so much as to a disappearence perspective as the letter writter and muchcommonsense wrote about. My guess is that a shopping cart is around 3 – 3&1/2 feet from the seating area to the ground. The floor is usually time on top of concrete (not very soft) if a child is left unattended, they could CV’S tumble over and cause (very) serious damage to themselves.
May HaShem watch over all of us and keep all of us safe and secure!