The problem with letting the child tell you when they need to pee is that it starts to become a game and they ONLY have to pee when you say it is clean up time or you just sit down to feed the baby or you start an activity they are least intersted in like a story - ie your attention is not on them so they know they can get your undivided attention by yelling "pee". That is one of the biggest reasons why I insist on pullups during potty training is so that I stay in control of my day. We try potty at my convenience and regularly with the idea if a child can't hold it for the full hour then they are not ready for underwear anyways so will stay in training mode. They will come to be able to hold it and go at strategic times that are normal transitions for the group which saves a ton of time. Think about having three potty training which means 20-30 minutes per hour spent in the bathroom by the time they sit, try, wash, etc. There is more to daycare than potty training. It can not be the focus for more than a few days and if not working is put off to try again in a few weeks.