We did a 4 day weekend of Oh Crap when she was 28 months, then she had accidents at school and wasn't telling the teachers when she needed to go, so she wore diapers at school for about 3 months. They'd offer her the opportunity to pee at school, but otherwise she always had a diaper on there, but no diaper away from school (I'd put it on after taking her to the bathroom when I dropped her off, and take it off and take her to the bathroom before leaving. It worked out fine. After 3 months she felt more comfortable telling the teachers when she needed to go, and more importantly, could hold it until the regularly scheduled bathroom breaks at school. Now she doesn't wear diapers at all except for night time.
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