Related Experiment Video

Updated: Jun 10, 2026

The Other End of the Leash: An Experimental Test to Analyze How Owners Interact with Their Pet Dogs
08:59

The Other End of the Leash: An Experimental Test to Analyze How Owners Interact with Their Pet Dogs

Published on: October 13, 2017

Infant attachment security and the timing of puberty: testing an evolutionary hypothesis

Jay Belsky1, Renate M Houts, R M Pasco Fearon

  • 1Institute for the Study of Children, Families and Social Issues, Birkbeck University of London, London, United Kingdom. j.belsky@bbk.ac.uk

Psychological Science
|August 18, 2010
PubMed

Insights

Infant attachment insecurity predicts earlier puberty and menarche in females. This finding supports theories suggesting early life experiences shape reproductive development, influencing biological maturation timing.

Area of Science:

  • Developmental Psychology
  • Reproductive Biology
  • Attachment Theory

Background:

  • Life-history theories propose early rearing experiences, including infant-parent attachment security, influence psychological, behavioral, and reproductive development.
  • Attachment security is a critical factor in early development, potentially programming long-term life-history strategies.

Purpose of the Study:

  • To test the hypothesis that infant attachment insecurity predicts earlier pubertal maturation compared to infant attachment security.
  • To investigate the link between early attachment experiences and the timing of reproductive development in females.

Main Methods:

  • Longitudinal study of 373 White females from the NICHD Study of Early Child Care and Youth Development.
  • Data collected via annual physical exams (ages 9.5–15.5 years) and self-reported age of menarche.
  • Statistical analysis controlled for maternal age of menarche.

Main Results:

  • Infants classified as insecure showed earlier initiation and completion of pubertal development.
  • Insecurely attached individuals experienced an earlier age of menarche compared to securely attached individuals.
  • These effects remained significant even after accounting for maternal menarche timing.

Conclusions:

  • Early infant attachment insecurity is associated with accelerated pubertal maturation and earlier menarche in females.
  • Findings support a conditional-adaptational perspective on individual differences in attachment security.
  • Further research is needed to elucidate the biological mechanisms underlying the observed attachment-related effects on reproductive timing.

More Related Videos

Determination of Reproductive Competence by Confirming Pubertal Onset and Performing a Fertility Assay in Mice and Rats06:38

Determination of Reproductive Competence by Confirming Pubertal Onset and Performing a Fertility Assay in Mice and Rats

Published on: October 13, 2018

Limited Bedding and Nesting as a Model for Early-Life Adversity in Mice04:20

Limited Bedding and Nesting as a Model for Early-Life Adversity in Mice

Published on: July 12, 2024

Related Concept Videos

Attachment01:20

Attachment

Attachment is vital for infant development, as warm social interactions support growth and well-being. In a classic 1958 study by Harry Harlow, the significance of warmth and comfort in forming attachments was examined. Harlow separated newborn monkeys from their mothers and provided two artificial "mothers": one made of cold wire and the other covered in soft cloth. Despite the wire mother offering food, the infant monkeys preferred the comfort of the cloth mother, demonstrating that physical...
Theory of Romantic Attachment in Adulthood03:34

Theory of Romantic Attachment in Adulthood

Attachment is a long-standing connection or bond with others. While Attachment Theory was conceived in developmental psychology to describe infant-caregiver bonding, it's been extended into adulthood to include romantic relationships.
Relationship with Parents: Attachment01:28

Relationship with Parents: Attachment

Parent-child interactions lay the foundation for how we understand relationships throughout life. These interactions are not uniform across families; instead, they are shaped by a range of environmental, emotional, and behavioral factors unique to each caregiver-child dynamic. Social psychologists study these early relationships to understand how patterns formed in infancy influence social functioning and interpersonal behavior in adulthood.Attachment Theory and Early Relational ModelsJohn...
Attachment Styles01:24

Attachment Styles

Jeffrey Simpson's attachment theory suggests that early caregiver relationships shape lasting patterns of behavior and emotional regulation, known as attachment styles. These patterns are organized along two key dimensions: self-esteem and interpersonal trust. The intersection of these dimensions produces four primary attachment styles that typically persist throughout life and significantly influence how individuals form and maintain relationships.Secure Attachment StyleIndividuals with a...
Hazan and Shaver's Attachment Styles01:28

Hazan and Shaver's Attachment Styles

Attachment theory, developed initially to explain infant–caregiver bonds, has been extended to illuminate patterns of intimacy in adult romantic relationships. Psychologists Cindy Hazan and Phillip Shaver proposed that the attachment styles observed in infancy form a framework for how individuals approach emotional closeness and conflict in adulthood. These attachment styles—secure, avoidant, and anxious—are linked to enduring patterns of behavior and emotional regulation in adult relationships.
Signs of Puberty01:27

Signs of Puberty

Puberty is a critical phase, typically beginning between the ages of 8 and 13 in girls and 9 and 14 in boys, though timing can vary based on genetics, environmental factors, and overall health. This period is characterized by the development of secondary sexual characteristics and the attainment of reproductive potential. Endocrine changes underpin puberty, with hormonal surges of Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH) instigated by Gonadotropin-Releasing Hormone (GnRH)...