Physical growth and cognitive skills in early-life: evidence from a nationally representative US birth cohort

Jason E Murasko1

  • 1Dept. of Economics, Finance, Decision Science, & Marketing, University of Houston - Clear Lake, 2700 Bay Area Boulevard, Houston, TX 77058, USA.

Insights

Early childhood growth, measured by length/height, is linked to cognitive development from infancy through school entry. This early growth predicts kindergarten readiness better than later height, especially for girls.

Area of Science:

  • Child Development
  • Pediatric Health
  • Cognitive Science

Background:

  • Childhood growth and cognitive development are complex processes.
  • Understanding the early relationship between physical growth and cognitive skills is crucial for identifying developmental trajectories.
  • Previous research has explored links between nutrition, health, and cognition, but the specific role of linear growth requires further elucidation.

Purpose of the Study:

  • To investigate the association between early childhood length/height and cognitive skills across different developmental stages.
  • To determine if early growth is a more significant predictor of later cognitive outcomes than attained height.
  • To explore potential sex differences in the growth-cognition relationship.

Main Methods:

  • Utilized data from the Early Childhood Longitudinal Study--Birth Cohort (ECLS-B), a representative sample of US children.
  • Analyzed longitudinal data tracking children from infancy (9 months) through school entry (kindergarten).
  • Employed statistical methods to assess the association between length/height and cognitive measures, controlling for birthweight and socioeconomic status.

Main Results:

  • A significant positive association between length/height and cognitive skills was observed as early as 9 months of age, persisting through school entry.
  • Early growth trajectory emerged as a stronger predictor of kindergarten reading and math abilities compared to attained height at school entry.
  • This stronger predictive power of early growth was more pronounced in girls than in boys.

Conclusions:

  • Early physical growth is a critical factor influencing cognitive development in children.
  • Interventions promoting optimal early growth may have lasting benefits for cognitive outcomes.
  • The findings highlight the importance of considering early life as a sensitive period for the development of cognitive abilities, with potential sex-specific nuances.

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