There's another Daniel Tiger song about going potty before going out. For my 5 yo, I still reward him for good behaviors (marbles in a jar), so sometimes it's for stopping an activity and going potty. He also is more likely to go if I say I need to. And then I also tell him I can pee more than him and he hates to lose and counts really fast. When I'm desperate, I offer him a minute on my phone for every second of pee. His accidents have decreased but he definitely waits until the last possible moment before using potty. At school, ask the teacher for an extra opportunity to go before or after lunch.
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