Parents don't always realize that their child is potty trained at home because that is all they do is put the child on and off, ask them if they have to go etc. The child also learns early on that it is a way to have the power in the house in the sense that if they say "pee" every adult drops what they are doing and dotes on the little darling for a few minutes and then gives them treats. Hey I would pee on demand for that too. In daycare life isn't like that. Saying you have to pee means leaving the playroom, leaving your friends, leaving your game and going to the bathroom - not as much fun. I do not do treats here for bathroom as I feel it is a natural part of learning just the same as other things are. We don't give smarties for drinking from a cup or using a spoon or putting on our shoes or finishing a puzzle and I think potty is the same. A child just does it because they are growing up. Children stay in a pull up with me till I say. I do let some go through a phase where they wear their underwear and a pullup over the top. The child it too young to be independent in the bathroom and you need to explain to the parents that you are dealing with lots of kids and can't always take the child right away etc. Ask for pullups, or plastic pants over the underwear or ask that they get one of the waterproof covers meant for over cloth diapers but use it over the underwear instead of with the liners - will work the same as plastic pants but probably easier to find these days.