Autism symptoms usually appear in the first two years of life. Early signs include limited eye contact, not responding to their name, few gestures, and repetitive play or strong routines. Every child is different, and only a qualified professional can diagnose autism.

Noticing that your child plays, talks or reacts differently from other children can be worrying. You may wonder whether it is a phase or something more. This guide explains the most common autism symptoms in children by age, what they can look like day to day, and what to do if you have concerns. It is written to inform you, not to label your child.

What Is Autism Spectrum Disorder?

Autism spectrum disorder (ASD) is a neurodevelopmental condition. It affects how a person communicates, interacts with others and experiences the world around them. The word "spectrum" reflects how different autistic people are from one another. Some need a lot of support in daily life, others need very little.

According to the US National Institute of Mental Health, autism can be diagnosed at any age, but symptoms generally appear in the first two years of life.

Autism Symptoms by Age

Autism symptoms tend to fall into two areas: social communication, and repetitive behaviours or strong interests. Below are signs that the US Centers for Disease Control and Prevention (CDC) lists for different ages. A child may show some of these signs without being autistic, and an autistic child will not show all of them.

9 to 18 months

Does not respond to their name by 9 months
Shows few facial expressions by 9 months
Does not play simple back-and-forth games, such as peek-a-boo, by 12 months
Uses few or no gestures, such as waving, by 12 months
Does not point to show you something interesting by 18 months

2 to 5 years

Does not notice when others are hurt or upset by 24 months
Does not join other children in play by 36 months
Does not pretend to be something else, such as a teacher or superhero, by 48 months
Repeats words or phrases over and over
Lines up toys and gets upset when the order changes

School age

Some children, especially those with strong language skills, are only noticed at school. Autism symptoms at this age can include difficulty making or keeping friends, taking language very literally, finding group work or noisy classrooms overwhelming, and having very intense interests in specific topics.

Social Communication Signs

Social communication is about how children connect with others. You might notice that your child avoids or rarely holds eye contact, prefers to play alone, finds it hard to share enjoyment with you, or does not use gestures to communicate. Some children speak late. Others speak early but use language in an unusual way, for example talking at length about one topic without noticing the listener's interest.

Repetitive Behaviours and Sensory Differences

Needing the same routine every day and becoming very upset by small changes
Playing with toys in the same way each time, or focusing on parts of objects
Flapping hands, rocking or spinning
Strong reactions to sounds, smells, tastes, textures or lights
Very focused, intense interests

Signs That Are Often Misunderstood

Some autism symptoms are mistaken for other things. A child who does not respond to their name may first be checked for hearing problems. Meltdowns can be seen as bad behaviour, when they are often a response to sensory overload or sudden change. Girls may mask their difficulties by copying peers, so their autism symptoms are recognised later. In multilingual families, which are common in the UAE, speech differences can be put down to learning several languages.

What to Do If You Notice These Signs

Write down what you notice, when it happens and in which situations.
Share your observations with your paediatrician or your child's nursery or school.
Trust your instincts. You know your child best, and asking early is never a mistake.
Ask for a developmental assessment with a qualified professional.

How a Developmental Assessment Helps

A developmental and autism assessment looks at your child's communication, social interaction, play, behaviour and development. It usually combines a detailed conversation with parents, observation of your child and standardised tools. The aim is to understand your child's strengths and needs, not just to give a label.

Whatever the outcome, you leave with a clearer picture and practical next steps. If your child needs support, our child psychologists can work with you and your child's school.

Key Takeaways

Autism symptoms usually appear in the first two years of life, but some children are only noticed at school.
Signs fall into two areas: social communication and repetitive behaviours or strong interests.
No child shows every sign, and some signs can have other causes.
Girls and multilingual children are sometimes recognised later.
If you are worried, a developmental assessment gives clear answers and next steps.

Frequently Asked Questions

At what age can autism be diagnosed?

Autism can be diagnosed at any age. Signs often appear in the first two years, and an experienced professional can assess young children as well as teenagers and adults.

Can autism symptoms appear later?

Autism is present from early childhood, but some children are only noticed later, when social demands at school increase or when they can no longer hide their difficulties.

Is autism a mental illness?

No. Autism is a neurodevelopmental condition, a different way of experiencing and processing the world. Some autistic people also experience anxiety or other mental health difficulties and can benefit from support.

If you have noticed some of these autism symptoms in your child, you do not have to work it out alone. Call us on +971 58 557 6220 or book a developmental assessment.