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
Freeing Your Child From Anxiety, Revised and Updated Edition
Tamar E. Chansky Ph.D., Tamar E. Chansky