Age range: Preschool through 2nd grade.

Recommended for: This book helps kids to recognize when they’re feeling grumpy (and maybe also sad, as is common with grumpiness), and it gives children permission to feel grumpy without needing to try to fix it right away. The story validates how annoying it is when everyone tries to give you unsolicited advice for how to feel better, and it ends with a sweet moment between friends who agree that “it’s a wonderful day to feel grumpy.”