The Whole-Brain Child by Dan Siegel and Tina Payne Bryson was one of those books that I read and then instantly began implementing some of the techniques with my students. While not a yoga/mindfulness book per se, it integrates beautifully with these practices and provides easy-to-digest information about why kids act the way they do. Specifically, The Whole-Brain Child goes into the science of kids' brains and explains how each part of the brain interacts and influences the others. It really opened my eyes to some of my more behaviorally or attention-challenged students, and how I may not have been engaging with them in the most effective ways - especially when they are in the middle of a difficult situation.
But The Whole-Brain Child not just for parents/teachers of students who are struggling. On top of providing excellent background on how kids' brains develop, this book also gives practical suggestions for how to deal with challenges, conflicts, anxiety or strong emotions that may arise in any child's life. Preventative ideas and activities for helping kids manage and talk about their feelings are included throughout as well, and there's a handy "refrigerator sheet" included in the back with quick reminders for each activity. A terrific book for both parents and teachers!