Start with high-confidence emotions books, then narrow by subgenre or adjacent topics.
How to Do the Work
Dr. Nicole LePera, Nicole LePera
Tiny Humans, Big Emotions
Alyssa Blask Campbell, Lauren Elizabeth Stauble
Mama's Last Hug
Frans de Waal
The Journey From Abandonment to Healing: Revised and Updated
Susan Anderson
How to Talk So Little Kids Will Listen
Joanna Faber