Here is another post by Dr. Richard Selznick that I have copied in full. LINK
Don't Wait for the School's Blessings: Trust Your Gut
Anxiety over a child’s school-based problems can start very early.
After reading The Shut-Down Learner, a mom contacted me. “My son’s drowning in in school. Do you think he could be a shut-down learner,” she asked.
After asking a few more questions, I was struck by the fact that the child in question was only six in the beginning of first grade.