A glass is on the floor, in pieces. Your six-year-old is standing over it, and you hear your own voice say the sentence your parents said to you: “Why did you do that?”

The silence that follows is long. Then comes the shrug, and the small, flat answer: “I don't know.”

You hear it as stonewalling. Maybe as defiance, or a dodge. But here is the uncomfortable possibility: your child is giving you the most accurate answer they have.

The question assumes a skill they haven't built yet

“Why did you do that?” sounds simple. It isn't. To answer it, a child has to do several things at once. They have to replay the moment, notice what they were feeling, work out which feeling drove the action, put a word to it, and then say it out loud to a large, visibly unhappy person.

That is a lot of machinery. The parts of the brain that support reflecting on your own mind keep developing through childhood and well into the teens. A four- or seven-year-old is still building it. In the moment of the glass breaking, the real sequence was probably something like: hot feeling in my chest, arm swings, crash. No explanation was ever stored, because none was ever made.

So when your child says “I don't know,” the honest translation is often, “I can't see the part of me that did that.”

Even adults are worse at this than they think

This isn't only a kid problem. In a famous 1977 paper, psychologists Richard Nisbett and Timothy Wilson reviewed studies showing that adults often can't accurately report what influenced their own choices. Asked why they did something, people frequently offered a sensible-sounding explanation that had little to do with what actually moved them. The explanation was built after the fact, from what seemed plausible.

If grown adults confabulate reasons, imagine asking a five-year-old for a reliable account of their own motives, under pressure, with a broken glass nearby.

That pressure matters too. A “why” question, especially after a mistake, rarely lands as curiosity. It lands as a charge. Children are quick to hear the unspoken second half: Why did you do that? (There is no good reason, is there?) Shame arrives, and shame narrows thinking. A child flooded with it has even less access to the answer than before.

What “why” teaches instead

If you keep asking and the child keeps failing to answer, two things can happen, and neither is good.

The first is that they learn to make something up. Kids are remarkably good at sensing which answer ends the interrogation. “He took my toy” or “I was just playing” gets offered because it works, not because it's true. You've trained a small storyteller rather than a self-observer.

The second is quieter. They learn that their inner life is a place where they are expected to have answers and don't. That's a lonely lesson. It's the root of the teenager who, years from now, says “I don't know, I just feel weird,” and means it, because nobody ever helped them look.

Swap the question: from motive to ingredients

You don't need your child to explain why. You need to help them gather the ingredients, the observable pieces that a later understanding gets built from. Questions about what happened are concrete, and a young child can answer them.

  • “What happened right before?” This rebuilds the timeline. Often the trigger is hiding there: the sibling's comment, the tower that fell.
  • “What was your body doing?” Hot face, tight fists, wobbly tummy. Bodies are easier to describe than motives.
  • “Was it more mad, sad, or scared?” A short menu of feelings is far easier than a blank page. Offering choices is a kind of scaffolding, like giving a child a ladder instead of asking them to jump.
  • “What did you want to happen?” Nearly every misbehavior is a clumsy attempt at a need. “I wanted to be first.” “I wanted her to stop.”

Notice that none of these asks the child to defend themselves. They invite the child to be a co-detective rather than a suspect.

Offer a guess, and let them correct you

Sometimes even those questions get a shrug. That's when your own narration helps, which is the same move behind emotion coaching in general. You offer a tentative guess and hold it loosely:

“I wonder if you felt really frustrated when the game wouldn't work. Is that close, or is it something else?”

Two details matter here. The word “wonder” keeps it a hypothesis rather than a verdict. And inviting correction gives your child something easier than generating an answer from scratch: judging whether a given answer fits. Recognizing is far easier than recalling, at any age.

If you guess wrong, nothing is lost. “Not frustrated, it was more like… embarrassed” is a tiny act of self-discovery, and you handed it to them.

Timing: don't investigate during the storm

One more reason “I don't know” is true in the moment: a child who is still upset is not in a state to reflect. When the body is flooded, the thinking brain is largely offline, and the questions above will bounce off.

So sequence it. First comes safety and calm, and your steady presence usually does more than any sentence. Later, when the glass is swept up and the child is soft again, you can say, “Want to figure out what happened earlier?” Sometimes the best time is at bedtime, side by side, with no eye contact required. Many kids open up more when you're sitting next to them than facing them.

Your next moves

  • Retire one “why” this week. Pick the next time you'd say “Why did you do that?” and replace it with “What happened right before?” Notice what changes in your child's face.
  • Build a three-option feeling menu. Decide on your go-to trio (mad, sad, scared works well) and use it any time a shrug appears. Say, “Was it more this, this, or this?”
  • Offer one wondering guess a day. “I wonder if…” plus “Is that close?” Take whatever correction they give with a thank-you.
  • Name your own motive out loud. At dinner, say, “I snapped earlier. I think I was tired and worried about work.” Children learn that behavior has causes by hearing yours explained, without any quiz attached.
  • Schedule the talk for later. When there's a blow-up, say, “We'll talk about it after dinner,” and then actually do, in a calm moment, side by side.

What “I don't know” is really asking for

When your child says it, they aren't closing a door. More often they're standing in front of one and asking, without words, for someone to help them find the handle. That's the work of the early years: learning that there is a someone inside who has reasons, and that those reasons are worth looking for.

That's the idea we built Bigfeels around. Its feeling cards (anger, fear, sad, big-feels) give a young child something to point at when words won't come, and each comes with a short co-use prompt for you and your child to explore together. A quick daily check-in keeps the practice in calm moments, which is exactly when “I don't know” starts to turn into “I think I was mad.” If that sounds useful, you can take a look at https://bigfeels.lumenlabs.works. Either way, the next time a shrug comes, try asking what instead.