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When she was in first grade, she'd report every detail of her school day: the lunch menu, who she was paired with in gym class, what the teacher said. Dinner was a running commentary. By fourth grade, "how was your day?" gets "fine" and "nothing much," and the conversation is over.
The anxiety that frames this as a breakdown in communication is understandable. But what developmental research actually shows is that in most cases this reduction is not a sign of relationship deterioration — it is a natural expression of the development of autonomy.
Here is what the developmental literature says about the period when children begin keeping secrets.