How to ask whether it is all right to bring an item to school (for health reasons)
In this case, you want your child to bring or use an item for health reasons. Adding a doctor’s comment will carry more weight. Adding how your child is looking forward to the activity gives the impression of your cooperative attitude towards school activities.
Model
Conversational flow and useful expressions
Greeting
Your child’s thoughts and feelings
Doctor’s comment
Whether it is all right or not
Closing
Parent's name
Supplement
Attaching "~chan" to a girl's name or "~kun" to a boy's name is usually only done when addressing or referring to children besides your own. It is not very common to attach "~chan" or "~kun" to your own child's name, especially in public.