Very Overwhelming

How do you know where to draw the line between a sensory disorder and a quirky kid? I'm checking lots of things off, but at the same time these things aren't causing my child to have a more challenging existence. Yes, they're odd and yes, they're noticeable, but that's just him. He seems to do quite well, despite them. Actually, I think a lot of his quirks have been tuned down as he's gotten older and he even is able to find ways to not show them in school and outside the home.

If your child covers their ears and feels overwhelmed with a loud sound, do you put them through all the testing and treatment? Or do you simply say, "yes, that was loud, but it's over now". I want to be a sensitive, helpful, pro-active parent, but if these issues aren't negatively affecting his everyday life in a gigantic way, would I be making things worse by putting him in therapy?

I'm just confused by all of this.