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What Is Autism Regression and When Does It Happen? 

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

Autism regression refers to the loss of previously acquired skills in children with autism. This can include a decline in language abilities, social skills, or other developmental milestones that were previously progressing. The onset of autism regression is typically observed between the ages of 18 months and 3 years, although the timing can vary from child to child. 

During autism regression, a child may lose the ability to communicate verbally or show a reduced interest in social interactions, both of which were previously developed. This developmental decline can be especially concerning parents as they may notice a significant shift in their child’s behaviour and abilities. 

How Autism Regression Presents Itself 

Ways autism regression commonly appears in children: 

Loss of Skills:

Children who have been developing language skills may suddenly stop speaking or may use fewer words than they did before. Similarly, previously learned social behaviours, such as responding to their name or making eye contact, may decrease or disappear. 

Social and Emotional Changes:

A child experiencing autism regression may withdraw from social interactions and show less interest in engaging with peers or caregivers. 

Changes in Behaviour:

Children may exhibit new behaviours, such as increased irritability, repetitive actions, or sensory sensitivities. 

Autism regression can be an early sign of autism onset and should be monitored closely. Early intervention is crucial for addressing developmental delays and helping the child regain lost skills. For expert advice and tailored consultations, visit providers like Autism Detec for one-on-one 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
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
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. 

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