If your child got sick the previous day at school, you may write a note to inform the school of how your child was feeling afterwards. In this case, you will let the school know that your child seemed fine, and that there is no further cause for worry. It is not necessary to give specific examples of what your child says, but doing so will give the teachers a better idea of how your child is doing.
Conversational flow and useful expressions
Thanking the school for taking child to medical facility
Child's words (optional)
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.