Good beginning but I think Lucas is wrong because you described him and making him act like a toddler of 16-24 month and not a four year old because even if was late to potty train he should act more independently and don’t need playpen etc
While not directly related to stenting, I’ve seen that SiliconeNozzle website before and always wondered, are the longer sounds with holes in the center supposed to allow you bladder to empty on its own? Probably a dumb question 😅