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"My Baby Isn't Shy Around Strangers" — Stranger Wariness and Attachment Quality Are Separate Things

By Leon MoriguchiPublished May 15, 2026Updated May 18, 20265 min read日本語版あり
Audience
Parents of children 6 months–2 years

TL;DR

  • ·Stranger wariness follows four distinct developmental trajectories, and roughly one in four children remain consistently low throughout — a friendly baby who never fusses around strangers is statistically normal, not an anomaly
  • ·What the Strange Situation assesses is reunion behavior with the caregiver, not reaction to strangers; attachment security and stranger wariness are largely independent in the research literature despite being conflated in popular understanding
  • ·The informative question is whether the child uses the caregiver as a secure base — moving away to explore and returning when uncertain — not how many strangers produce visible distress

Contents

  1. Lead
  2. What Stranger Wariness Actually Is
  3. Temperament, Not Attachment: Kagan's Contribution
  4. What the Strange Situation Actually Measures
  5. What Does Warrant Attention
  6. Summary
  7. References

Lead

"Our baby smiles at everyone. She never fusses around strangers at all — I worry sometimes that she doesn't have a real bond with us."

You hear this kind of concern. You also hear the opposite: "Our son gets so upset around unfamiliar people. Every visit to the in-laws is a production." Both reactions come from genuine, careful observation. Both also rest on the same underlying confusion: the assumption that how strongly a child reacts to strangers is a window into the quality of that child's attachment.

It isn't. Stranger wariness and attachment security are related in the popular imagination but largely independent in the research literature. Understanding why is worth the effort.

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