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A Rat Model of Mild Intrauterine Hypoperfusion with Microcoil Stenosis
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Severe small size for gestational age and cognitive function: catch-up phenomenon possible.

James F Paulson1, Suneet P Chauhan, James B Hill

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Newborns with low birth weight for gestational age (GA) show initial cognitive delays but catch up by age two. Academic performance remains comparable through kindergarten, indicating no long-term deficits.

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Area of Science:

  • Pediatric developmental neuroscience
  • Child psychology
  • Public health and epidemiology

Background:

  • Birth weight for gestational age (GA) is a key indicator of fetal development.
  • Infants born with low birth weight for GA may face developmental challenges.
  • Understanding long-term cognitive outcomes is crucial for early intervention.

Purpose of the Study:

  • To compare cognitive functioning in children born with birth weight below the 3rd percentile for GA versus those at or above the 3rd percentile.
  • To track cognitive development from infancy through kindergarten age.

Main Methods:

  • Analysis of singleton, nonanomalous infants from the Early Childhood Longitudinal Study-Birth Cohort.
  • Use of confounder-adjusted general linear models to assess associations between weight for GA and cognitive outcomes.
  • Cognitive assessments conducted at 9 months, 2 years, preschool, and kindergarten.

Main Results:

  • Infants below the 3rd percentile for GA (16% of the cohort) had 12 percentile points lower cognitive performance at 9 months (P < .001).
  • No significant cognitive differences were observed by 2 years of age (P = .668).
  • Academic performance in reading and math at preschool and kindergarten ages showed no significant differences between groups (P > .245).

Conclusions:

  • Infants born with low birth weight for GA demonstrate catch-up cognitive functioning by 2 years of age.
  • No significant decrements in academic functioning are evident by kindergarten.
  • Early life growth parameters do not appear to predict long-term academic achievement in this cohort.