Can Maternal Inflammation During Pregnancy Affect Fetal Brain Development?

PostedNovember 30, 2025

UpdatedNovember 30, 2025

ByMy Patient Advice

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

Growing research shows that maternal inflammation and autism risk may be closely linked, particularly when inflammation occurs during key stages of brain formation. During pregnancy, the mother’s immune system can become activated by infections, stress, or other factors, triggering inflammation that may interfere with the baby’s neurodevelopment. This immune activity is now recognised as a potential contributor to maternal inflammation and autism risk.

When inflammation becomes chronic or poorly managed, it can cross the placenta and influence how the fetal brain develops. Studies have found that such disruptions in prenatal health may alter the formation of neural circuits that are essential for communication, behaviour regulation, and sensory processing—hallmarks affected in autism spectrum disorder. The relationship between maternal inflammation and autism risk continues to be a critical focus in the field of developmental neuroscience.

How Maternal Inflammation and Autism Risk Impact Brain Development

Here are the primary ways maternal inflammation and autism risk might shape outcomes:

Disruption of fetal neurodevelopment

Inflammatory molecules, if present during early pregnancy, can alter brain structure and connectivity. This can delay or misroute key processes involved in neurodevelopment, particularly in areas related to language and social function.

Effects on prenatal health and immunity

Poor prenatal health or unmanaged maternal illness can worsen inflammation, compounding the risk. Addressing infections and reducing maternal stress may help minimise maternal inflammation and autism risk during pregnancy.

Importance of timing

The second trimester appears especially sensitive to inflammation-related effects. Targeted interventions during this window may help support healthier fetal brain development.

Visit providers like Autism Detect for personal consultations to explore how maternal inflammation and autism risk may affect your child’s development and ways to support optimal prenatal health.

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.