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At What Age Can Signs of Autism Be Detected in Infants? 

Posted
Updated
ByMy Patient Advice
Author: Lucia Alvarez, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

Signs of autism in infants can sometimes be detected as early as 6 months, though many symptoms don’t become fully apparent until later. Early diagnosis is crucial as it enables parents and caregivers to seek the right support and interventions, which can significantly improve developmental outcomes. The autism detection age can vary, but recognising signs of autism early helps in addressing any delays or concerns before they become more pronounced. 

In infants, the early signs of autism are often subtle and can easily be overlooked. Many of these early symptoms may be mistaken for typical developmental variations. However, when a baby shows certain signs, such as a lack of eye contact, delayed cooing, or reduced social responsiveness, it can be a signal that further assessment is needed. As infants grow, these early signs may evolve into more identifiable patterns of behaviour. 

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Early Diagnosis and Detection 

Detecting autism in infants can be challenging, but there are a few common signs that may emerge within the first year of life. These signs can be crucial in helping doctors and specialists determine whether a child is on the autism spectrum. 

Delayed Social Interaction

One of the first signs of autism in infants is a lack of social engagement. Infants may not smile or make eye contact as expected or may not respond to their caregiver’s voice or facial expressions. These early signs can be an indication that the infant might be experiencing challenges with social communication. 

Limited Communication Skills

Babies with autism often exhibit delays in early communication skills. They may not babble or coo by the typical age of 6 months, and by 12 months, they may not yet be trying to communicate with gestures, sounds, or eye contact. This delay in communication development is a key sign to watch for. 

Repetitive Movements

While most infants engage in repetitive actions, such as kicking their legs or reaching for objects, infants with autism may show more intense repetitive behaviours, such as rocking, hand-flapping, or lining up toys. These actions may become more noticeable as they approach their first birthday. 

For personalised guidance and support, visit providers like Autism Detect for one-on-one consultations. Detecting early signs of autism at a young age allows for timely interventions and better developmental outcomes. 

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

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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. 

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