Early Signs of Autism in Toddlers: What to Look For, Age by Age

In a toddler, the earliest signs of autism are often things you expect to see and don't: not turning when you call their name by around 12 months, little eye contact, no pointing to show you things, few gestures, slow or lost words, repetitive movements like hand flapping, and big reactions to noise, textures or changes in routine.

None of these signs means something has gone wrong. Autism is a difference in how a child's brain takes in and makes sense of the world, not a disorder to be cured, and seeing it that way changes the question you ask. Instead of "what is wrong with my child?", the more useful question is "how is my child experiencing this?" Less eye contact, lining things up or flapping when excited are often a child's ways of managing a world that feels louder, brighter and less predictable to them than it does to you. Stimming, the repetitive movements many autistic children use, helps them regulate. It is not something to train out of them.

This guide sets out the signs by age first, then how to tell a passing phase from a pattern, how signs can look different in girls and the strengths that often come with them. The practical steps and supports in Ireland come at the end.

How do I tell if my toddler has autism?

You look for a pattern, not a single behaviour. One missed milestone, a toddler who hates the hoover or a child who is slow to talk is not, on its own, a sign of autism. What clinicians look for is a cluster of differences in how your child communicates, plays and responds to their senses, showing up at home, at crèche and with grandparents, and lasting weeks and months rather than days.

Three questions help you sort what you are seeing:

• Is it consistent? Does it happen most days and in most places, or only when your child is tired, unwell or somewhere new?
• Is it about connection? Many of the earliest signs are about sharing: glancing at your face to see how you feel about something, pointing to show you a dog, bringing you a toy just so you can admire it.
• Is more than one area involved? Differences in social communication alongside repetitive play or strong sensory reactions tell you more than a difference in one area alone.

You don't have to be certain before asking for help, and only a qualified assessment team can make a diagnosis. The HSE suggests talking to your public health nurse, your GP, your local children's disability network team (CDNT) or anyone else who sees your child regularly, and you can refer your child to a CDNT yourself. Ask for a hearing check early on as well, because a child who doesn't react to voices needs that ruled out first.

What are the signs of autism in a toddler, by age?

Signs tend to appear in a rough order, so the lists below are grouped by age. Treat the bands as a guide rather than a deadline: every child develops at their own pace, and autistic children differ from each other as much as any children do. In the first year and a half especially, most signs are about something being missing or rare rather than something unusual being present.

At 12 to 18 months

• May not look round or respond when you call their name, yet react straight away to other sounds, like a favourite theme tune or a crisp packet
• May make less eye contact, or rarely check your face to see how you feel about something
• May not smile back when you smile at them
• May not point to show you something interesting, though they may reach or point to get something they want
• May not wave bye-bye, nod or shake their head
• May take your hand and put it on the thing they want opened, without looking at you
• May show little interest in back-and-forth games like peek-a-boo or round and round the garden
• May rarely copy what you do, such as clapping or sticking out your tongue
• May seem content alone for long stretches, or not seem to notice when you leave the room

At 18 to 24 months

• May say few or no words, and not make up for it with gestures
• May stop using words, babble or social games they had before
• May repeat words or whole lines from TV exactly, often in the same tone, which is known as echolalia
• May not follow a simple request unless it is part of a familiar routine, so "get your shoes" only works when the shoes are in view
• May be fascinated by parts of objects, like wheels, light switches, fans or air vents
• May line up toys or sort them by colour or size, and get very upset if the line is disturbed
• May flap their hands, spin, rock or flick their fingers, especially when excited or overwhelmed
• May be very distressed by everyday sounds, clothing labels or food textures
• May go looking for strong sensations, like crashing into cushions, spinning or tight squeezes

Losing skills deserves a special mention. It is easy to put down to a new sibling or a house move, and it is more common in autism than was once believed. One study that followed babies from early infancy found that, when parents were asked to look back or give yes-or-no answers, between 29 and 47 per cent of the autistic children were identified as having lost skills; when social behaviour was tracked visit by visit, a gradual decline turned out to be more common still. If your child has lost words or social skills at any age, raise it promptly rather than waiting.

If speech is your main worry, our article on how speech and language develop in autistic children goes further into milestones and echolalia. For the sensory side, see our article on sensory processing and autism.

At 2 to 3 years

• May show little interest in pretend play, like feeding a teddy or treating a box as a car
• May prefer play with real objects and clear rules, such as building, sorting, puzzles or water play
• May play beside other children without joining in, or watch from the edge of the group
• May find turn-taking and sharing very hard, not out of selfishness but because the unwritten rules don't come naturally
• May talk mainly to ask for things rather than to share or chat
• May have long, intense meltdowns when a routine changes without warning, such as a different route to crèche
• May cover their ears, hide or shut down in busy, noisy places like supermarkets or birthday parties
• May eat a very small range of foods, often one brand, colour or texture
• May have deep, focused interests they come back to again and again

By this age, preschool staff often notice the same things you do. If a room leader mentions that your child plays apart from the group or finds moving between activities very hard, treat it as useful information rather than criticism.

Is it typical variation or an autism red flag?

Plenty of toddlers talk late, are shy with strangers or are fussy about food. What separates typical variation from a sign worth acting on is usually whether your child finds other ways to connect with you, and how much the difference gets in the way of everyday life.

If your instinct tells you something is different, take it seriously. Parents are usually first to notice, and many describe having concerns early on. Asking early costs very little. If your child turns out not to be autistic, you have lost nothing; if they are, you and the people around them can start adapting sooner.

Do signs look different in girls?

Often, yes. Autistic girls can be harder to spot even as toddlers, because many of them notice early what other children are doing and copy it. This is called camouflaging, or autistic masking, and it can hide signs that would be obvious in a child who doesn't do it. Boys mask too. It is simply more common in girls, and the picture of autism that most checklists grew out of was drawn mainly from boys.

In a young girl, it can look like this:

• Watching other children closely and copying their games, phrases or gestures, often a beat behind
• Playing near a group, or shadowing one confident friend, rather than joining in on her own terms
• Seeming quiet, settled and "no trouble" at crèche, then having big meltdowns once she gets home
• Interests that look ordinary, like animals, a TV character or dolls, but pursued with unusual intensity, detail or rules
• Fewer obvious repetitive movements, with sensory distress showing instead as tears, clinging or refusing certain clothes and foods

The gap between crèche and home is the one to watch. A girl who holds it together all morning may be spending most of her energy doing so. Research comparing parent and teacher reports has found that parents of autistic girls describe noticeably more autistic traits than their teachers do, a bigger gap than for boys. Those studies are mostly of school-age children, but the pattern often begins earlier, so if a preschool tells you she is fine, give equal weight to what you see at home.

Our guide to autism in girls follows these signs through childhood, and our article on autism in women explains how the same pattern can go unrecognised well into adult life.

What are the strengths that often come with these signs?

The same way of processing the world that shows up in the lists above often brings real strengths, and the HSE names several of them in its own guidance on autism in children. Parents tend to see them early:

• Strong visual and auditory learning. Many autistic toddlers learn quickly from pictures, patterns, songs and sounds, and may know every word of a favourite book or recognise every shop logo on the street.
• Deep, sustained interests. A toddler who spends forty minutes on one puzzle or one set of trains is building a depth of concentration many adults would envy.
• A keen eye for pattern and detail. Lining things up, sorting by colour or spotting that a picture on the wall has moved all reflect a real feel for order and symmetry.
• A long and detailed memory. Remembering routes, the order of a routine or exactly what happened last time you visited somewhere.

Noticing strengths isn't about balancing bad news with good. It is practical. A child who learns visually will often cope better with a picture timetable than with spoken reminders, and a child with a deep interest can be reached through it. Starting from what your child does well is the basis of neuro-affirmative support, and a good assessment report should describe those strengths alongside your child's support needs.

What happens after you notice signs

Once you have noticed signs, there are two routes to an assessment in Ireland, plus several supports you can look into before or alongside either one. You can pursue more than one at a time. Act promptly if:

• your child has lost words, gestures or games they used to have
• they rarely respond to their name and their hearing has been checked
• you are seeing signs from more than one of the lists above, in more than one setting
• crèche or preschool staff have raised the same concerns you have

The public route. You can refer your child to your local CDNT yourself, or ask your GP or public health nurse to do it. Separately, the Disability Act 2005 gives your child the right to apply to the HSE for an Assessment of Need (AON), which by law should start within three months and finish within a further three. In practice, HSE figures show 23,282 children overdue an AON at the end of June 2026, and assessments finished in early 2026 took an average of 23 months. An AON looks at your child's needs and does not always include a diagnosis, but applying early secures their place while you consider other options; our Assessment of Need guide walks through the process.

The private route. A private assessment needs no GP referral and sits outside the public queue. At AutismCare it begins with a 60-minute parent consultation with a psychologist (€89), followed by a parent interview, a play-based assessment in clinic using tools such as the ADOS-2 (the second edition of the Autism Diagnostic Observation Schedule), and a feedback session with your written report. The full assessment costs €2,587, and many VHI, Laya and Irish Life plans refund part of that; our comparison of HSE and private assessments sets out the trade-offs.

The supports most families of toddlers look into are these:

• Preschool support (AIM). The Access and Inclusion Model helps children take a full part in the free ECCE (Early Childhood Care and Education) preschool programme, with supports ranging from advice and equipment to extra help in the room. Its targeted supports are based on your child's needs and do not need a diagnosis.
• Home Tuition Grant. For autistic children aged 2½ to 3, the Department of Education and Youth can fund up to 10 hours of home tuition a week. From age 3 it can fund up to 20 hours where the NCSE (National Council for Special Education) confirms no early intervention class place is available, and a formal autism diagnosis is required either way. Our Home Tuition Grant page covers eligibility.
• SNA support at school. Special Needs Assistants (SNAs) help with care needs such as safety, toileting and supervision rather than teaching, and their role is set out in Circular 0032/2026. Posts are allocated to the school rather than to an individual child, so how clearly your child's report describes their care needs matters. See our guide to SNA support.
• Domiciliary Care Allowance. Domiciliary Care Allowance (DCA) is a monthly payment, €380 in 2026, for a child under 16 who needs substantially more care and attention than other children their age. It is not means-tested, and what counts is the level of care your child needs, not the label itself; it also brings a medical card and the yearly €2,000 Carer's Support Grant.
• Tax relief. Private assessment and therapy fees qualify for 20% relief through Revenue's health expenses scheme, which on a full child assessment comes to about €517. Some families also qualify for the Incapacitated Child Tax Credit, which is €3,800 for 2026.

You don't have to do all of this at once. Most families start with a conversation, a hearing check and an AON application, then take the rest as each step becomes relevant. If you would like a clinician's view before deciding anything, a pre-assessment consultation is a simple place to start.