Is Regression More Common in Boys with Autism?

PostedNovember 5, 2025

UpdatedNovember 5, 2025

ByMy Patient Advice

Author: Lucia Alvarez, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

Yes, regression in boys with autism is more common than in girls, although it can occur in both genders. Studies show that boys are more likely to experience developmental delays and autism traits associated with regression, particularly in areas such as language and social skills. This regression often happens between 18 months and 3 years, a critical period in early childhood development.

The gender differences in autism, including the likelihood of regression, are still being studied. Boys tend to show more noticeable autism traits such as delayed speech, repetitive behaviours, and social withdrawal, which may contribute to a higher rate of regression. Girls, on the other hand, may experience less noticeable or more subtle symptoms, making regression less apparent in early development.

How Regression in Boys with Autism Manifests

Common signs of regression in boys with autism include the following behaviours:

Language and Social Skills Decline:

Boys with autism may lose previously acquired words or social behaviours, showing fewer social interactions or reduced speech.

Increased Repetitive Behaviours:

Regression may also involve an increase in autism traits like repetitive actions (e.g., hand-flapping or object fixation).

Challenges with Emotional Regulation:

Boys may also display more emotional outbursts or difficulties in regulating their emotions during regression.

Recognising regression in boys with autism early can help parents and caregivers address these challenges and seek appropriate interventions. For expert guidance and tailored consultations, visit providers like Autism Detect for personalised support specific to your child’s needs.

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to Early Signs & Symptoms of Autism.

Lucia Alvarez, MSc

Author

Lucia Alvarez is a clinical psychologist with a Master’s in Clinical Psychology and extensive experience providing evidence-based therapy and psychological assessment to children, adolescents, and adults. Skilled in CBT, DBT, and other therapeutic interventions, she has worked in hospital, community, and residential care settings. Her expertise includes grief counseling, anxiety management, and resilience-building, with a strong focus on creating safe, supportive environments to improve 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 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.