All feelings are valid and it's okay for kids to feel whatever they feel. What's important is how those feelings are managed.
This is a story of a little bunny who lost his first baby tooth and his big brother laughed at him. He feels sad and worries that people will make fun of him.
He went to his mother very sad and she shared a great life lesson:
The mother said, "Why are you sad if someone laughs at you?
"Find your happy thoughts inside, not outside of you."
It happens to me and everyone, go out and have some fun.
Let's throw a ball or eat some grass, and hop and skip and run."
Determined not to be sad, he left his social anxiety behind and goes out to make friends to play with.
Soon he meets Monkey who also lost a tooth. The two decide to form a club to make new friends. The club and new friends lead to situations in which the bunny and his friends have to make good decisions about not getting angry and choosing the best response to the actions of others.
This book teaches kids to look for things they may share with others rather than simply looking for differences.
How fun life is when we are all a bit different than each other.