Children start primary school, boys, usually don't train much, and now they can't pee by themselves. They often forget to take off their pants and wet their pants, so they can wear open-backed pants.
You can wear it, but you'd better not wear it. First of all, bring two more pairs of change pants. The teacher will help change wet pants and learn things quickly at school. Wearing open-backed pants will slow him down in learning to take care of himself. Every time he wets his pants at school, the teacher will tell him how to go to the toilet correctly. In a few days, he learned it himself. That's my niece!