In this case, you want to write a few words to a teacher on the occasion of your child's enrollment. Many parents write about the excitement of new school life. If you have a chance to speak to the teacher directly, there is no need to write in the renrakucho.
Many schools provide a renrakucho notebook to each family at enrollment. There will be a greeting from the preschool on the first page. When you write a reply to this, you can use the following model.
Conversational flow and useful expressions
Your child's new experience
*In some cases, parents will go to preschool with their children until their children adjust to the school.