Early Signs of Autism by Age Group
These are signs that may indicate autism, not a diagnostic checklist, and only a licensed professional can make a diagnosis. Many autistic children show some of these signs, and many non-autistic children show them too. Loss of previously acquired skills at any age is always worth discussing with a pediatrician promptly.
About This Guide
These are signs that may indicate autism, not a diagnostic checklist. Many autistic children show some of these signs. Many non-autistic children show them too. Only a licensed professional can make a diagnosis. The goal here is to give parents language for what they are observing.
Ages 0-2: Early Indicators
Signs in the first two years may include limited or no eye contact by 6 months, not responding to name by 12 months, no pointing or waving by 12 months, no babbling by 12 months, loss of previously acquired speech or social skills at any age, limited social smiling, and unusual responses to sensory input. Loss of previously acquired skills at any age is always worth discussing with a pediatrician promptly.
Ages 2-5: Emerging Patterns
Between ages 2 and 5, patterns may include differences in play (parallel rather than interactive, interest in parts of objects), language differences (echolalia, scripted speech, unusual tone), difficulty with transitions, strong sensory responses, limited imitation, differences in emotional expression, and hyperlexia (reading words above expected level with lower comprehension). Many autistic children receive their first diagnosis during this period.
Ages 5-12: School-Age Patterns
In school-age children, signs often become more visible in social contexts: difficulty with unstructured time, challenges with unwritten peer social rules, intense interests in specific topics, sensory challenges in school environments, meltdowns or shutdowns after school, and executive function challenges. High-masking autism, particularly in girls and gender-diverse children, may begin concealing signs during this period, delaying diagnosis.
Frequently Asked Questions
Can this guide tell me if my child is autistic?
No. These are signs that may indicate autism, not a diagnostic checklist, and only a licensed professional can make a diagnosis. Many autistic children show some of these signs, and many non-autistic children show them too. The goal is to give parents language for what they are observing.
What are early signs of autism in children ages 0 to 2?
Signs in the first two years may include limited or no eye contact by 6 months, not responding to name by 12 months, no pointing or waving by 12 months, no babbling by 12 months, loss of previously acquired speech or social skills at any age, limited social smiling, and unusual responses to sensory input.
What signs might appear between ages 2 and 5?
Between ages 2 and 5, patterns may include differences in play, language differences such as echolalia, scripted speech, or unusual tone, difficulty with transitions, strong sensory responses, limited imitation, differences in emotional expression, and hyperlexia. Many autistic children receive their first diagnosis during this period.
What does autism look like in school-age children ages 5 to 12?
In school-age children, signs often become more visible in social contexts: difficulty with unstructured time, challenges with unwritten peer social rules, intense interests in specific topics, sensory challenges in school environments, meltdowns or shutdowns after school, and executive function challenges.
Why might signs be missed in girls and gender-diverse children?
High-masking autism, particularly in girls and gender-diverse children, may begin concealing signs during the school-age period, which can delay diagnosis.
When should I talk to a pediatrician promptly?
Loss of previously acquired speech or social skills at any age is always worth discussing with a pediatrician promptly.
We are not doctors. We are advocates. Nothing on this site constitutes medical advice. Always consult a qualified healthcare provider about diagnosis, treatment, or any decision regarding your health or your child's health.