Welcome. I'm Elaine Aron, author of The Highly Sensitive Person and The Highly Sensitive Child, as well as The Highly Sensitive Person Workbook and The Highly Sensitive Person in Love, a book about how sensitivity affects our close relationships. I began researching high sensitivity in 1991 and continue to do research on it now, also calling it Sensory-Processing Sensitivity (SPS, the trait's scientific term). I never planned to write any self-help books, but those who have this trait seem to gain a great deal from knowing about it.
Are you highly sensitive? You can find out by taking the self-test. This test, the result of empirical research on the trait, gives you a good sense of what high sensitivity is, as well. To see if your child is highly sensitive there is another checklist.