That's good to know! I'm not worried about accidents - I know there will be some and that's perfectly normal. It's more the withholding of wee (although good to know he's got that ability I guess) and the very adamant "NO" every time he's asked if he needs it/wants to sit on the potty etc (even though he very clearly does need it)
We sometimes say “I’m going for a wee before tea. If you need to go too do you want to go first or second?” We also used the Pirate Pete book to begin with.
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We had three days of accidents every single time. Then one night he just ran off when we were playing and sat on the potty 🤷🏻‍♀️ Still get the odd accident but had a good 6 weeks of him doing really well since then.