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Maternal thyroid function during early pregnancy and cognitive functioning in early childhood: the generation R study

Jens Henrichs1, Jacoba J Bongers-Schokking, Jacqueline J Schenk

  • 1The Generation R Study, Erasmus Medical University Center, 3000 DR Rotterdam, The Netherlands.

The Journal of Clinical Endocrinology and Metabolism
|June 11, 2010
PubMed

Insights

Maternal hypothyroxinemia in early pregnancy is linked to a higher risk of cognitive delays in children. This study highlights the importance of monitoring thyroid function during pregnancy for optimal child neurodevelopment.

Area of Science:

  • Endocrinology
  • Developmental Psychology
  • Public Health

Background:

  • Thyroid hormones are crucial for fetal neurodevelopment.
  • Limited population data exist on maternal thyroid function and child cognition.

Purpose of the Study:

  • To investigate the association between maternal thyroid hormone levels in early pregnancy and children's cognitive development.
  • To examine the impact of maternal hypothyroxinemia and thyroid-stimulating hormone (TSH) and free thyroxine (FT4) levels on cognitive outcomes.

Main Methods:

  • Population-based cohort study in The Netherlands with 3659 mother-child pairs.
  • Maternal thyroid function (TSH, FT4) assessed at 13 weeks gestation.
  • Children's cognitive functioning (expressive vocabulary, verbal and nonverbal skills) assessed at 18 and 30 months.

Main Results:

  • Maternal TSH levels showed no association with cognitive outcomes.
  • Increased maternal FT4 levels were linked to a reduced risk of expressive language delay at 30 months.
  • Both mild and severe maternal hypothyroxinemia were associated with increased risk of expressive language delay.
  • Severe maternal hypothyroxinemia also predicted a higher risk of nonverbal cognitive delay.

Conclusions:

  • Maternal hypothyroxinemia during early pregnancy is a significant risk factor for cognitive delay in children.
  • These findings underscore the importance of maternal thyroid health for child neurodevelopment.
Abstract

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