How Does Maternal Thyroid Function Impact Foetal Brain Development?

PostedNovember 27, 2025

UpdatedNovember 27, 2025

ByMy Patient Advice

Author: Hannah Smith, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

Ongoing research is uncovering the critical connection between maternal thyroid and autism risk during pregnancy. The thyroid gland plays a vital role in regulating hormones essential for foetal growth, particularly brain development. When thyroid function is disrupted, especially in cases of hypothyroidism, it may increase the likelihood of developmental challenges, including autism. Understanding how maternal thyroid and autism risk are related helps highlight the importance of early thyroid monitoring in pregnancy.

Thyroid hormones influence numerous aspects of foetal brain development, including neuronal growth, migration, and synapse formation. If thyroid hormone levels are too low, especially in the first trimester, it can impair these crucial developmental processes. Several studies now suggest that abnormal maternal thyroid and autism risk levels are linked, raising concerns about undiagnosed thyroid disorders in expectant mothers.

How Maternal Thyroid and Autism Risk Interact with Brain Development

Here are some ways maternal thyroid and autism risk may influence a child’s neurodevelopment:

Impact of hypothyroidism on early brain development

Hypothyroidism in pregnancy can lead to reduced levels of thyroid hormones critical for foetal brain development. Without sufficient hormonal support, the foetal brain may develop atypically, which has been associated with an increased risk of autism.

Thyroid hormone imbalance and autism-related traits

Disruptions in thyroid hormone levels have been linked to changes in social, cognitive, and emotional development. These imbalances further support the link between maternal thyroid and autism risk, particularly in pregnancies without early intervention.

Importance of early screening and treatment

Recognising and managing thyroid issues early in pregnancy can significantly reduce risks. Monitoring maternal thyroid and autism risk can guide clinicians in supporting optimal brain development from the earliest stages.

Visit providers like Autism Detect for personal consultations to understand how maternal thyroid and autism risk may affect your child’s development and explore targeted prenatal care options.

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to Maternal Health and Infections.

Hannah Smith, MSc

Author

Hannah Smith is a clinical psychologist with a Master’s in Clinical Psychology and over three years of experience in behaviour therapy, special education, and inclusive practices. She specialises in Applied Behavior Analysis (ABA), Cognitive Behavioural Therapy (CBT), and inclusive education strategies. Hannah has worked extensively with children and adults with Autism Spectrum Disorder (ASD), ADHD, Down syndrome, and intellectual disabilities, delivering evidence-based interventions to support development, mental health, and well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy.

Dr. Rebecca Fernandez, MBBS

Reviewer

Dr. Rebecca Fernandez is a UK-trained physician with an MBBS and experience in general surgery, cardiology, internal medicine, gynecology, intensive care, and emergency medicine. She has managed critically ill patients, stabilised acute trauma cases, and provided comprehensive inpatient and outpatient care. In psychiatry, Dr. Fernandez has worked with psychotic, mood, anxiety, and substance use disorders, applying evidence-based approaches such as CBT, ACT, and mindfulness-based therapies. Her skills span patient assessment, treatment planning, and the integration of digital health solutions to support mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the reviewer's privacy.