As a parent, few things matter more than watching how your toddler grows, plays and communicates. If you have found yourself wondering whether your child is developing the way other children their age are, you are not alone — and paying attention is exactly the right thing to do. Learning to recognise the early signs of autism in toddlers is one of the most valuable things any parent can do, because the sooner a child receives the right support, the better their long-term outcomes tend to be.

This guide explains what the early signs of autism spectrum disorder (ASD) look like at each age, the areas of development where they usually appear, and exactly what to do if you have concerns.

Quick answer The most common early signs of autism in toddlers include limited eye contact, not responding to their name, not pointing or showing objects to share interest, delayed or absent speech, repetitive movements such as hand-flapping or rocking, and unusually strong reactions to sounds, textures or lights. These signs most often become noticeable between 12 and 24 months of age.

When do the signs of autism usually appear?

Some signs can be present as early as 6 to 12 months, but many parents first notice that something feels different between 18 months and 2 years. The American Academy of Pediatrics recommends that every child be screened specifically for autism at their 18-month and 24-month check-ups, alongside the general developmental checks done at every well-baby visit.

A formal diagnosis is usually confirmed from around 18 to 24 months onwards, though it can come later. Importantly, some children develop typically for a while and then lose skills they had already gained — such as words, babbling or social interaction. This is called regression, and it should always be discussed with a professional promptly.

Early signs of autism by age

The table below groups the most widely recognised signs by age. Remember: every child develops at their own pace, and missing a single milestone is not, on its own, a sign of autism. What matters is a pattern of signs across several areas, or the loss of skills a child already had.

By this age	Signs worth discussing with a professional
6 months	No warm, joyful smiles; very little eye contact
9 months	Little back-and-forth sharing of sounds, smiles or facial expressions
12 months	No babbling; no gestures such as pointing, showing, reaching or waving; not responding to their name
16–18 months	No meaningful single words beyond “mama” or “dada”; little or no pretend play
24 months	No meaningful two-word phrases (not counting simple imitation or repeating)
Any age	Loss of speech, babbling, gestures or social skills that were previously present (regression)

The three areas where autism signs show up

Autism affects development across three broad areas. Signs can appear in one area more than another, and the picture is different for every child.

1. Social communication and interaction

This is where the earliest and most reliable signs often appear. You might notice:

• Limited or fleeting eye contact, or looking past people rather than at them.
• Not responding to their own name by 12 months.
• Not pointing or showing objects to share interest — for example, not holding up a toy to show you. This “joint attention” is one of the strongest early indicators.
• Little interest in other children, or preferring to play alone.
• Few gestures such as waving, nodding or shaking the head.
• Delayed speech, or using words and then stopping.

2. Repetitive behaviours and focused interests

Many autistic toddlers show repetitive movements or a strong need for sameness:

• Repetitive movements such as hand-flapping, rocking or spinning.
• Lining objects up in precise order, or focusing intensely on one part of a toy (such as spinning wheels).
• Repeating words or phrases they have heard, sometimes much later (echolalia).
• Strong distress when a routine changes, even in a small way.

3. Sensory sensitivities

Children on the spectrum often experience the sensory world differently:

• Over-reacting to sounds, lights or textures — for example, covering their ears or refusing certain clothing or foods.
• Under-reacting to pain, temperature or their name being called.
• Seeking out particular sensations, such as staring at spinning objects or lights.

Signs that deserve prompt attention: any loss of words, babbling, gestures or social skills at any age should be reviewed by a professional without delay. Regression is always worth taking seriously.

Every child develops differently

It is worth repeating: one or two “late” milestones do not mean a child is autistic. Children develop at their own pace, and a late talker is not automatically an autistic child. What professionals look for is a consistent pattern across social, communication, behavioural and sensory areas — not a single missed step.

Two things are also important to know. First, autism can look different in girls, whose signs are often subtler and more easily missed. Second, there is no credible scientific evidence linking vaccines to autism; large studies involving millions of children have confirmed this. Above all, trust your instincts as a parent — if something feels different about your child’s development, it is always reasonable to ask.

What to do if you think your toddler may be autistic

If you recognise several of the signs above, here are the practical steps to take.

1. Note what you observe. Keep a short log of specific behaviours, when they happen and how often. Concrete examples help a clinician enormously.
2. Talk to your paediatrician. Raise your concerns at the next well-baby visit, or book an appointment specifically to discuss development.
3. Complete a validated screening. The M-CHAT-R is a short, free 20-question parent questionnaire designed for toddlers aged 16 to 30 months. It does not diagnose autism, but it flags whether a fuller evaluation is worthwhile.
4. Seek a comprehensive assessment. A developmental paediatrician, child psychologist or specialist multidisciplinary team can carry out a full evaluation and, where appropriate, a diagnosis.
5. Do not wait for a label to start support. Early intervention can begin even before a formal diagnosis is confirmed — and starting sooner makes a real difference.

Why early support makes such a difference

The toddler years are a period of extraordinarily rapid brain development, which is precisely why early intervention is so powerful. Well-designed, individualised therapy during this window helps children build communication, social, play and daily-living skills at the very time their brains are most ready to learn them. Many children make remarkable progress, and early support can meaningfully change a child’s long-term path.

Early intervention is not about “curing” autism — autism is a lifelong difference in how a person experiences the world. It is about giving each child the tools, confidence and support to communicate, connect and thrive on their own terms.

How we support families in Abu Dhabi

Ability Pediatric Rehabilitation Medical Center is a CARF-accredited, MOH-licensed child development centre in Abu Dhabi. Our multidisciplinary team provides developmental assessment and a full range of evidence-based therapies under one roof, including behaviour intervention (ABA therapy), speech and language therapy, occupational therapy and structured early intervention programmes. We also coach and train parents so that progress continues at home.

If you have concerns about your toddler’s development, you do not need to wait and worry. Book an assessment with our team and we will help you understand your child’s needs and the best next steps.

Frequently asked questions

At what age can autism be detected in toddlers?

Some early signs can appear by 6 to 12 months, but autism is most often noticed between 18 and 24 months. Routine autism screening is recommended at the 18-month and 24-month check-ups.

My toddler doesn’t make much eye contact — does that mean autism?

Not on its own. Reduced eye contact can be one sign of autism, but it can also occur for other reasons. What matters is whether it appears alongside other signs across social, communication and behavioural areas. If you are unsure, it is always reasonable to ask a professional.

Can autism be diagnosed at 18 months?

Yes, a reliable diagnosis is possible from around 18 months in many children, though for some it is confirmed later. Screening at this age helps decide whether a full assessment is needed.

Does a speech delay always mean autism?

No. Many children with a speech or language delay are not autistic. However, because delayed speech can sometimes be one part of the picture, it is worth having any significant delay assessed — both to rule autism in or out and to provide the right support.

What is the difference between autism and ADHD?

Both can affect attention and behaviour, but autism primarily involves differences in social communication and repetitive interests, while ADHD centres on attention, impulsivity and activity levels. Some children have both. A specialist assessment can tell them apart.

Can early intervention cure autism?

Autism is a lifelong neurodevelopmental difference, so it is not something to be cured. Early intervention is about building skills, confidence and independence — and starting early can significantly improve a child’s communication, learning and quality of life.

Sources

• CDC — Learn the Signs. Act Early. (developmental milestones)
• CDC — Signs and symptoms of autism spectrum disorder
• Autism Speaks — Signs of autism & M-CHAT-R screening
• American Academy of Pediatrics — autism screening at 18 & 24 months