I'm sort of wondering what the boundries are. Just theorectically, what makes this a bad rule? Is it the age of the child and would it be OK if it were a six year old asleep in the stroller? Is it a mobility thing? (not likely, at 19 months most kids walk.) Is it the stroller, in which case is it ok if my 75 year old grandmother in a wheelchair goes barefoot? Is it the sleeping, in which case is it ok if I leave my husband barefoot on a bench outside the shop napping? Is it some combination?
This isn't a flame, I'm just wondering where the line is crossed. For me, I think its mobility - once you walk, you need to wear shoes in most public places, so enforcement of this seems reasonable to me.