I knew a couple kids who couldn't control their bladder at night time until they were 9 and 10. One was only having accidents a couple times a week until a big stressor change, then she was pretty much nightly for a long time.

I used to babysit one who had accidents at 7 and whenever it was for the night, I just covered the bed with a sheet of plastic, covered with a couple beach towels, then the bed sheet. She wore pull-ups at home, not my place, and had less accidents at my place than at home.

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