Short, focused, behaviour-based programmes outperformed long, broad ones
Meta-analyses of 70 interventions targeting parental sensitivity and attachment security
Reviewed by Sian Trombley, CCCFounder, Thrive Family Company
Strong confidence
Source citation
Bakermans-Kranenburg M. J., van IJzendoorn M. H., Juffer F. (2003). Less is more: Meta-analyses of sensitivity and attachment interventions in early childhood. Psychological Bulletin. https://doi.org/10.1037/0033-2909.129.2.195
Published 1 January 2003 · Added to Thrive 26 July 2026 · Reviewed 26 July 2026
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More support should mean more benefit. In attachment work, the data say the opposite.
Published research findings
The study
The authors pooled 70 studies of interventions designed to increase parental sensitivity and infant attachment security.
What researchers examined
Which intervention features predicted improvements in sensitivity and attachment.
What they found
Programmes with fewer sessions, a clear behavioural focus and a defined start and end produced larger gains than long, multi-component programmes. Improved sensitivity was linked to improved attachment security.
Thrive editorial interpretation
What this may mean for families
Depth of insight is not the active ingredient. Concrete, observable changes in how a parent responds are.
What this doesn't tell us
Important limitations
Findings apply mainly to infancy and early childhood, and long-term follow-up was limited.
Evidence confidence describes how much weight this study's design can carry — not how strongly the finding applies to any individual child or family.
Therapist perspective — Thrive interpretation, not a finding of the study
Therapist Perspective
It is permission to keep the work small. One specific behaviour, practised, beats a year of general reflection.
Practical family considerations
Change one specific response, not your whole parenting philosophy.
This research summary is educational and does not replace individualized medical, psychological or therapeutic advice.
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Attachment security predicts social competence — modestly, and alongside everything else
2017 · Meta-analysis
Moderate confidence
Why it matters
Attachment matters, but it is one contributor among temperament, environment and later relationships — not a verdict issued in infancy.