DD just started potty training at daycare. They don't allow Pull-Ups except at nap because they are too absorbant. For some reason, they don't allow the training pants with plastic attached. They use training pants with separate plastic pants. Here's a link:
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We use the Gerber Training Pants and Gerber Plastic Pants. It's going well so far. It also works if you can let them run around naked at home. DD NEVER has an accident when she is naked. She'll even nap naked for 2 hours without an accident.