I'm puzzled by the comment about the CM not wanting you to go into the restroom with your child. Unless they have remodeled the restroom, it is a "single person" place on the Magic, not a series of stalls...and parents were welcome to take their child to the restroom before dropping them off or when checking on them.
Unfortunately, there is a wide range of what is "allowed." The answers you'll get seem to depend on the CM, and do not always follow the written literature that
DCL puts out. That said, the literature/web site, etc are not always consistent either!
We're seeing a lot more flexibility now than previously. Initially, kids in the Club had to be fully trained, which meant able to handle clothing, hand washing, etc. Pull ups and diapers were not allowed at all....then came OK in the late evenings, exceptions made for special needs kids, etc. Now it seems to be that almost anything goes, but the CMs are NOT able to change a child. You will be paged for an accident.
My suggestion--take your child to the restroom when you drop him/her off, and then check on him/her about once an hour...and take him to the restroom each time you check on him. That way, you avoid accidents and avoid clothing issues.
For ALL kids, take them to SEE the restroom the first time they go to the Oceaneer's Club. We think it's funny, but sometimes they don't think to ask if there is one....it helps them to know it's there and it's child sized!