Potty training is not about going around with a bare bum. At minimum child should be in underwear and pants that absorb such as sweat pants. Child is not ready for training at daycare until they are ready to tell you they need to go. Otherwise they stay in diapers and are put on at strategic times if they ask such as when they wake from nap dry - this is usually the first pee I catch at daycare and that is my first sign.