How do maternal infections during pregnancy affect early autism diagnosis? 

Recent research suggests that maternal infections during pregnancy may influence early autism diagnosis in children. Infections such as influenza, urinary tract infections, or even high fevers during key stages of foetal development can affect the brain’s immune environment, increasing the likelihood of atypical neurological outcomes. 

The impact of these infections is complex and often depends on their timing. Infections during the first and second trimesters are more strongly linked to developmental conditions, including autism. This connection has prompted researchers and clinicians to pay closer attention to maternal infections and autism diagnosis, especially in cases where early developmental delays are observed. 

How Infections Influence Maternal Infections and Autism Diagnosis 

Here are some key ways maternal infections can affect how and when autism is diagnosed: 

Changes in neurodevelopmental timing 

 Infections may disrupt typical brain development, leading to early signs of autism such as delays in speech, reduced eye contact, or unusual sensory responses. These early indicators can help clinicians make a more timely and accurate differential diagnosis. 

Increased immune response in the womb 

Some infections trigger heightened immune activity in the placenta, which can affect how the brain forms connections. This may result in subtle behavioural differences that prompt earlier screening and, potentially, earlier intervention. 

Visit providers like Autism Detect for personal consultations to understand how maternal health and sensory processing impact your child’s development and how to support effective sensory regulation and comfort. 

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.