Fundamentally, I don't really want to be exposed to your childs bowel movements, regardless if they are wet or brown in a public space where I will be eating and relaxing, when there are acceptable changing facilities on hand for use. Its just disgusting and totally unnecessary - frankly it boils down to laziness on the part of the parents. If you want a baby then pay the price, cost and embuggarance on your lifestyle and change it in the toilet, rather than inflicting your child on everyone else.