REALITYWIPE

RESEARCHERS

The Science of Second-Child Guilt: Why Love Multiplies, Not Divides

3 the researchers behind it — 'How can I love another child as much as my first?' is the question nearly every expectant parent of a second child asks — and attachment science has

Tavistock Institute of Human Relations, London

John Bowlby

Known for:Founding attachment theory — the proposal that early caregiver interactions produce internal working models of self and others that shape relationship expectations throughout life

Key findings

  1. 1969

    In Volume 1 of Attachment and Loss, Bowlby proposed that infants develop internal working models from early caregiver interactions — templates of what to expect from self and others — and that disrupted or unpredictable caregiving produces models primed to detect threat and maximize proximity to the attachment figure. ↗

University of Virginia

Mary D. Salter Ainsworth

Known for:The Strange Situation procedure — a laboratory paradigm that identified secure, avoidant, and anxious-ambivalent infant attachment patterns and established the behavioral signatures later traced into adult relationship anxiety

Key findings

  1. 1978

    Ainsworth and colleagues described the Strange Situation and its three main attachment patterns: secure (moderate distress, effective settling on reunion), avoidant (little distress, dismissing caregiver), and anxious-ambivalent (exaggerated distress, difficult to soothe). The anxious-ambivalent pattern — hyperactivated distress plus approach-avoidance on reunion — became the infant model for what adult attachment research would call anxious attachment. ↗

King's College London (Professor Emerita)

Judy Dunn

Known for:Foundational observational research establishing sibling rivalry and jealousy as normal, developmentally shaped features of family life

Key findings

  1. 1982

    Observing families from the birth of a second child, Dunn and Kendrick found rivalry and jealousy to be a normal, near-universal reaction, strongly shaped by how differently parents treated each child from the very start. ↗

  2. 1992

    Reviewing the accumulated evidence, Dunn concluded that the quality of the sibling relationship — how much warmth versus rivalry it carries — shows continuity from early childhood and is linked to children's broader social understanding, not just to how they get along at home. ↗

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