toddlers (and I mean ones that are really still tottery) should be kept in their pushchairs instead of being allowed to get out? It's stressful enough shopping on a busy weekend without having to walk at a snail's pace behind a toddler walking along with two oblivious, dewy-eyed parents watching adoringly as their offspring falls over for the hundredth time.
There are plenty of places to let small children wander, shopping centres at a weekend are not one of them!