I agree with pull ups over undies-both for the dcg to feel wet, and for the Mom to understand. IME, pull ups DO set back potty training. I think the poor girl will get mixed messages, that it's ok to pee her pants at daycare, she has a diaper. My oldest potty trained at 19mo, her provider (Montessori school) requested 5 pairs of underwear and a long shirt (no pants, to make it faster), and just watched her closely (she was going at predictable times and asking to go, but had accidents if really involved in play). For in my home and travelling, I used cloth trainers (protect furniture, but feel wet). For children in my daycare, they have all been different. I consider them trained when they consistently ask to go in time.