Second hand, but I've heard that diapers can delay potty training because they keep things drier so it's less noticable.
A couple tips I've seen around the internet:
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Put on regular underwear underneath the diaper so wetness is felt more but contained.
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Make a bed lasagna. Mattress protector, sheet, protector, sheet. That way when there are accidents you can just rip off the top 2 layers, put it in the wash, and go to bed still protected for round 2.
I'm betting it's the 10¢ packets that bear very little resemblance to real ramen.