Pregnant woman with a protective aura, symbolizing thyroid health and a healthy baby.

Pregnancy & Thyroid: How Maternal Health Impacts Your Child's Development

Soraya Malik monogram
Soraya Malik in Health & Wellness November 2026 • 4 min read.

"Uncover the link between thyroid disorders during pregnancy and the potential increased risk of cerebral palsy in children. What every expecting parent should know."


Becoming a parent is filled with excitement and countless questions, especially about ensuring your baby's health. While you're likely focused on nutrition and prenatal care, there's another crucial factor to consider: your thyroid health. The thyroid gland regulates metabolism and plays a vital role in fetal development.

Cerebral palsy (CP), the most frequent motor disability in childhood, has long been a concern for parents and medical professionals alike. Recent research is shedding light on the potential connection between maternal thyroid disorders during pregnancy and an increased risk of CP in children. While the exact causes of CP are complex, understanding the contributing factors can empower you to make informed decisions about your health and your baby's well-being.

This article dives into a groundbreaking study that explores this link, offering insights into how maternal thyroid health can impact a child's neurological development. By understanding the potential risks and taking proactive steps, you can help ensure a healthier future for your little one.

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Maternal Thyroid Disorders and Cerebral Palsy

A population-based investigation examined whether maternal thyroid disorder during pregnancy was associated with cerebral palsy in children. The study used two populations, Denmark and Norway, each selected for a distinct research advantage. Register-based and self-reported information was analyzed in relation to cerebral palsy and its unilateral and bilateral spastic subtypes using multiple logistic regression.

Decoding the Study: Thyroid Disorders and Cerebral Palsy Risk

Pregnant woman with a protective aura, symbolizing thyroid health and a healthy baby.

A large-scale population-based cohort study was conducted, utilizing data from Denmark and Norway. The study aimed to investigate whether maternal thyroid disorders are associated with an increased risk of cerebral palsy in children. The researchers looked at data from over 1.2 million children born in Denmark between 1979 and 2007, as well as data from the MOthers and BAbies in Norway and Denmark (MOBAND) collaboration cohort, which included over 192,000 children born between 1996 and 2009.

The study considered various factors, including maternal diagnoses of thyroid disorders (hypothyroidism, hyperthyroidism, and unclassifiable thyroid disorder) and cerebral palsy subtypes (unilateral spastic and bilateral spastic). Here's a summary of the critical points:

  • Hypothyroidism: Characterized by an underactive thyroid gland, leading to insufficient thyroid hormone production.
  • Hyperthyroidism: Characterized by an overactive thyroid gland, resulting in excessive thyroid hormone production.
  • Cerebral Palsy (CP): A group of disorders affecting movement, muscle tone, and posture due to brain damage that occurs before, during, or shortly after birth.
  • Unilateral Spastic CP: CP primarily affecting one side of the body.
  • Bilateral Spastic CP: CP affecting both sides of the body, mainly impacting the legs.
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Updated Pregnancy Guidance

The American Thyroid Association provides guidelines addressing thyroid disease before conception, during pregnancy, and after delivery. The source specifically identifies these as new ATA Guidelines for Thyroid Disease in Preconception, Pregnancy, and Postpartum. This places thyroid management across the full reproductive period within a formal clinical-guidance framework.

Evidence from Treatment Studies

Prospective randomized studies have begun producing data on the effects of treating thyroid disease during pregnancy. The research considers outcomes for the mother, fetus, and the future intellect of the unborn child. Because these studies were described as recently completed and as addressing critically needed evidence, conclusions about treatment effects have been an important area of ongoing evaluation.

Thyroid Hormones and Neuromotor Development

Thyroid hormone deficiency during critical periods of development can severely damage the nervous system, according to the cited review. However, the specific effects of thyroid hormones on neuromotor development are described as less certain. The review notes that evidence has accumulated suggesting thyroid hormone deficiency might be one cause of cerebral palsy, while stopping short of presenting that relationship as fully settled.

The results revealed that maternal thyroid disorder identified during pregnancy was associated with an increased risk of unilateral spastic cerebral palsy. However, maternal thyroid disorder overall was not related to bilateral spastic cerebral palsy. These findings suggest a potential link between thyroid imbalances during pregnancy and specific types of CP.

Empowering Expecting Parents: Taking Control of Your Thyroid Health

While this study highlights a potential risk, it's crucial to remember that most women with thyroid disorders have healthy pregnancies and children. If you're planning a pregnancy or are already expecting, prioritizing your thyroid health is essential. By working closely with your healthcare provider, you can manage any existing thyroid conditions or address new concerns that may arise. Regular monitoring, appropriate medication, and a healthy lifestyle can all contribute to a smoother pregnancy and a brighter future for your baby. Don't hesitate to ask questions and seek support – your health and your baby's well-being are worth it!

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What the Cohort Study Examined

The cited population-based cohort study investigated whether maternal thyroid disorder during pregnancy was associated with an increased risk of cerebral palsy. It used register-based and self-reported information about maternal thyroid disorder. The analysis also considered cerebral palsy overall and its unilateral and bilateral spastic subtypes through multiple logistic regression.

Protecting Fetal Development

The cited article presents thyroid disorders during pregnancy as a potential concern for a child's later risk of cerebral palsy. It describes a recent study as finding a significant connection between thyroid disorders in pregnancy and increased cerebral palsy risk in children. The article frames its discussion around fetal development and practical advice for expectant mothers.

Maternal Health and Child Development

The cited source examines the potential impact of maternal thyroid disorders during pregnancy on a child's risk of developing cerebral palsy. It emphasizes that thyroid health is relevant to discussions of child development and pregnancy outcomes. The article also focuses on steps that may be taken to support a healthy pregnancy.

Understanding the Study's Purpose

Cerebral palsy is described in the cited study as the most frequent motor disability in childhood, while its etiology remains incompletely understood. The study notes a proposed link between prenatal thyroid hormone disturbances and cerebral palsy risk. Its objective was to investigate whether maternal thyroid disorder was associated with increased cerebral palsy risk in a population-based cohort.

Related findings on thyroid status and pregnancy

A separate meta-analysis linked maternal subclinical hypothyroidism and hypothyroxinaemia with indicators of intellectual disability in offspring. Those outcomes differ from cerebral palsy, so the findings add related developmental context rather than a direct comparison of the same outcome.[1]

For isolated maternal hypothyroxinaemia, a meta-analysis reported higher relative risks for several obstetric and birth outcomes than among euthyroid women. These comparisons concern pregnancy outcomes, not the cerebral palsy outcome described above.[2]

The cited treatment literature has not resolved long-term neurodevelopmental effects: the reviewed treatment studies were not designed to assess those outcomes. A CATS cohort limitation also notes that about one-third of women treated with levothyroxine had FT4 above the 97.5th percentile at the specified gestational measurement.[3] [4]

What remains uncertain about thyroid and development

  • Does the association with unilateral spastic cerebral palsy reflect a causal effect, or could other factors account for it? The reported association alone cannot distinguish these possibilities.[5]
  • How might maternal iodine status in early pregnancy relate to developmental outcomes beyond verbal IQ? The cited result identifies sensitivity for that outcome, but does not establish a connection to cerebral palsy.[6]
  • What long-term effects, if any, do pregnancy treatments have on offspring neurodevelopment? The treatment studies described here were not designed to answer that question.[3]

Guidance and thyroid terms

What is the scope of the current ATA guidance?

The American Thyroid Association’s guidance covers care before, during, and after pregnancy; it was developed in light of substantial evidence emerging since its prior guidelines. The cited account says the evidence base includes low-to-moderate-quality evidence and describes the guidance as a framework for individualized care.[7] [8]

What does isolated maternal hypothyroxinaemia mean?

It is defined as free thyroxine in the lower 2.5–5th percentile of the pregnancy-related reference range alongside a normal maternal thyroid-stimulating hormone concentration.[2]

Sources

  1. Maternal thyroid hormone insufficiency during pregnancy and risk of neurodevelopmental disorders in offspring: A systematic review and meta‐analysis (pmc.ncbi.nlm.nih.gov)
  2. Obstetric and offspring outcomes in isolated maternal hypothyroxinaemia: a systematic review and meta-analysis (pmc.ncbi.nlm.nih.gov)
  3. Association of maternal levothyroxine use during pregnancy with offspring birth and neurodevelopmental outcomes: a population-based cohort study (pmc.ncbi.nlm.nih.gov)
  4. No significant impact of levothyroxine treatment of maternal subclinical hypothyroidism on brain morphology in adolescence: insight from long-term follow up of Controlled Antenatal Thyroid Screening ( (pmc.ncbi.nlm.nih.gov)
  5. Maternal thyroid disorder in pregnancy and risk of cerebral palsy in the child: a population-based cohort study (pmc.ncbi.nlm.nih.gov)
  6. Association of Maternal Iodine Status With Child IQ: A Meta-Analysis of Individual Participant Data (pmc.ncbi.nlm.nih.gov)
  7. ATA Guidelines & Statements | American Thyroid AssociationATA Guidelines & Statements | American Thyroid Association (www.thyroid.org)
  8. American Thyroid Association 2026 Guidelines for Thyroid Disease in Preconception, Pregnancy, and Postpartum. (journals.sagepub.com)

About this Article -

Written with AI assistance from published research, and reviewed by the Mystum team. See our About page for more information.

Everything You Need To Know

1

What's the connection between thyroid issues during pregnancy and cerebral palsy?

Maternal thyroid disorders, specifically hypothyroidism, hyperthyroidism, and unclassifiable thyroid disorders, have been associated with an increased risk of cerebral palsy in children. Cerebral Palsy (CP) is a group of disorders affecting movement, muscle tone, and posture due to brain damage that occurs before, during, or shortly after birth. This is significant because it highlights a potential connection between a mother's thyroid health during pregnancy and the neurological development of her child.

2

What are hypothyroidism and hyperthyroidism, and why do they matter during pregnancy?

Hypothyroidism is characterized by an underactive thyroid gland, which leads to insufficient thyroid hormone production. Hyperthyroidism, on the other hand, is characterized by an overactive thyroid gland, resulting in excessive thyroid hormone production. These conditions are important because the thyroid gland plays a vital role in regulating metabolism and supporting fetal development. Imbalances in thyroid hormone levels can potentially impact a child's neurological development, as suggested by the increased risk of unilateral spastic cerebral palsy.

3

What's the difference between unilateral and bilateral spastic cerebral palsy in the context of thyroid disorders?

The study indicates a link between maternal thyroid disorders and an increased risk of unilateral spastic cerebral palsy in children, but not bilateral spastic cerebral palsy. Unilateral Spastic CP primarily affects one side of the body, while bilateral spastic CP affects both sides of the body, mainly impacting the legs. This distinction is important because it suggests that the impact of thyroid disorders may vary depending on the specific type of cerebral palsy. Further research may be needed to fully understand the mechanisms behind this link.

4

As an expecting mother, what steps can I take to manage my thyroid health?

Expecting mothers can take control of their thyroid health by working closely with their healthcare provider. Regular monitoring of thyroid function, appropriate medication if needed, and maintaining a healthy lifestyle are essential steps. Proactive management can help ensure a smoother pregnancy and reduce potential risks associated with thyroid disorders. Consulting with healthcare professionals and asking questions about thyroid health is vital for both the mother's and the baby's well-being.

5

How was the study about thyroid disorders and cerebral palsy conducted, and why is this important?

The study utilized data from Denmark and Norway, examining over 1.2 million children born in Denmark between 1979 and 2007 and over 192,000 children in the MOthers and BAbies in Norway and Denmark (MOBAND) collaboration cohort born between 1996 and 2009. This large-scale population-based cohort study is significant because it provides substantial data to investigate the association between maternal thyroid disorders and cerebral palsy risk. By analyzing extensive data, researchers aimed to identify potential links and contributing factors, enhancing our understanding of this complex issue.

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