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The influence of birth size on intelligence in healthy children

Birit F P Broekman1, Yiong-Huak Chan, Yap-Seng Chong

  • 1Department of Psychological Medicine, National University of Singapore/National University Health System, Singapore 119074, Singapore.

Pediatrics
|June 2, 2009
PubMed

Insights

Birth size within the normal range, including length, weight, and head circumference, is linked to higher childhood IQ scores in Asian children. These findings suggest early growth influences cognitive potential.

Area of Science:

  • Pediatric Health
  • Developmental Psychology
  • Human Genetics

Background:

  • Birth parameters are theorized to impact intelligence (IQ).
  • Research on normal birth size ranges and IQ is limited.
  • Understanding early growth influences on cognitive development is crucial.

Purpose of the Study:

  • To investigate the association between birth length, birth weight, head circumference, and gestational age within the normal range and childhood IQ in Asian children.

Main Methods:

  • A cohort of 1979 Asian children (aged 7-9) in Singapore was followed from 1999.
  • Birth parameters were recorded by health professionals.
  • Childhood IQ was assessed using Raven's Standard Progressive Matrices (ages 8-12).

Main Results:

  • A mean IQ score of 114.2 was observed.
  • Each 1-cm increase in birth length correlated with a 0.49-point IQ increase (P < .001).
  • Each 1-kg increase in birth weight correlated with a 2.19-point IQ increase (P = .007).
  • Each 1-cm increase in head circumference correlated with a 0.62-point IQ increase (P = .003).
  • Associations remained significant after excluding premature or extremely sized infants.

Conclusions:

  • Longer birth length, higher birth weight, and larger head circumference within the normal range are associated with higher IQ in Asian children.
  • Antenatal growth factors, even within normative ranges, may influence cognitive potential.
  • Findings have implications for early intervention and preventative strategies targeting cognitive development.
Abstract

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