I would never let a daycare child go pantless in my home (or my own children during daycare hours) as I believe it is inappropriate and is unsanitary just as the other parent voiced concern about. I have a child in my daycare who potty trained at 18 months and I went through a very similar thing. At home she was fine and telling her parents when she needed to go, but at daycare she had a ton of accidents in the first week and did not tell me. I persisted and it got better and she is still diaper free a few months later, but I am still having problems. She never tells me when she needs to go and she often resists when I take her at the regular times unless I make it fun (we make the stuffed toys go pee pee first etc). It takes a lot of my time and energy to do this whole routine each time she needs to go to the bathroom and she still has frequent accidents. I don't think parents understand that home and daycare are very different. In retrospect, I think next time I would have asked the parents to wait and try again later, not so much because of the age, but because she is not fully cooperative with the process and months later still not telling me until after she's peed her pants. Another note, I wouldn't have expensive rugs in my daycare area because someone is bound to pee or poop or puke on it at some point in time! That is why I don't take the kids in my livingroom.