Start with high-confidence children's mental health books, then narrow by subgenre or adjacent topics.
Tiny Humans, Big Emotions
Alyssa Blask Campbell, Lauren Elizabeth Stauble
The Whole-brain Child
Daniel J. Siegel M.D., Tina Payne Bryson
The Self-driven Child
William Stixrud PhD, Ned Johnson
Freeing Your Child From Anxiety, Revised and Updated Edition
Tamar E. Chansky Ph.D., Tamar E. Chansky
A Little SPOT of Emotion 8 Book Box Set (books 1-8: Anger, Anxiety, Peaceful, Happiness, Sadness, Confidence, Love, & Scribble Emotion)
Diane Alber
The Amazing Generation
Jonathan Haidt, Catherine Price
