I think you missed the point.
For example, as a young child I hated meat, and it wasn't until years later that I figured out that it was because my jaw got sore very quickly when having to chew a lot. My parents tried very hard to get me to eat meat back then, but if they had not pushed me, but instead let me be and listened to me, they might have figured it out. This one sounds a lot like the hand-licking case in TFA.
For another example, as a child I sugar-lowed very often. More than once I went to my parents feeling very sick and my dad just took my temperature and said "you're fine" when in fact the temp. was rather low and a sign of sugar lowing. It would have been very nice to have figured this out years earlier than I eventually did. The worst sugar low I remember happened while I was 16 and driving home from a movie theater (where I'd had a huge candy bar and soda), and I had no idea what was up. At one point I was driving on a long, windy, hilly, busy two-way street, with a passenger, and I felt like I was going to die at any moment. I could have killed someone because of something trivial that no one stopped to think about.
Here's another: I used have episodes of losing eyesight for a few seconds. My dad actually took me to an ophtalmologist's office where they did a battery of tests on me and never found the issue. Eventually I figured it out one time when I passed out after a blood draw: I was having low blood pressure episodes. This one is a case where doctors were unable to figure out something rather trivial.
Here's another: as a kid my mom used to be punished for what turned out to be bad eyesight. What the heck!
Books like "What to Expect While Expecting" and "What to Expect the First Year" are fantastic and very useful to parents. Imagine a "Debugging for Parents" book that taught, among other things, not to see every odd behavior as misbehavior. Wouldn't that be fantastic?! I think it would be.