How can you tell if your child might be autistic? Early signs by age

Parents often notice a difference before they know what to call it. Perhaps their child does not turn when their name is called, rarely points to share something interesting or finds changes much harder than expected. It is reasonable to ask questions. Asking does not mean you have already decided your child is autistic.

This article describes possible patterns at different ages. These are not deadlines, a screening test or a diagnosis. Every child develops differently. Our Understanding autism guide explains the wider picture and how assessment works.

Look for a pattern, not a single sign

Autism involves differences in social communication and interaction alongside restricted or repetitive patterns of behaviour or sensory experience. A speech delay alone does not establish autism. Neither does lining up toys, enjoying a routine or occasionally not responding while absorbed in play.

Notice whether several concerns occur together and across different situations. Think about what your child understands, how they share attention, how they express needs and what their play looks like. Hearing, language development and other factors can influence what you see.

A professional can help interpret those observations. Your job is not to prove a diagnosis. It is to describe your child's experience and ask whether support or assessment would be useful.

Around 12 months

During the first year, families may begin to notice differences in social responses or shared attention. A child may not consistently turn towards their name, may use fewer gestures or may show less back and forth enjoyment with familiar people. These concerns can have different explanations.

Watch everyday moments rather than staging repeated tests. Does your child look towards you during a game? Do they show interest in something you point at? How do they ask for help or invite you into an activity? A familiar setting may show more than a stressful encounter with someone new.

Do not force eye contact or make it the only measure of connection. A child may show attention through movement, sound or a brief glance. If you have concerns about responses or milestones, raise them during routine child health care.

Around 18 months

Differences in pointing, gestures, language and shared interest may become easier to notice during the second year. Some children use few words, seem less interested in showing objects to another person or respond inconsistently to their name. Others may repeat movements or strongly prefer familiar activities.

Pointing to request something and pointing to share enjoyment are not exactly the same. Describe both to the assessment team if you can. Also notice whether your child follows a gesture, brings you a favourite toy or uses another way to communicate.

CDC guidance describes autism specific screening at 18 and 24 months in routine US developmental care. Screening is not a diagnosis, and local arrangements may differ. You can ask about developmental assessment at any age rather than waiting for a particular appointment.

Around 2 to 3 years

As communication and play become more complex, differences may be more visible. A child may have delayed speech, repeat phrases, find shared pretend play difficult or prefer repeating the same activity. Changes to a route, food or routine may cause significant distress.

Sensory responses may also stand out. Your child might cover their ears, seek movement or find certain textures uncomfortable. These experiences deserve attention whether or not autism is eventually diagnosed. The question is what makes daily life manageable for your child.

A child who speaks clearly can still need support with social communication. Conversely, a child with few words may connect in many other ways. Look beyond word counts and ask about understanding, gestures, play and interaction together.

At school age

Some children are identified later, especially when early differences were subtle or the child managed well in familiar settings. School brings group activities, changing routines, friendships and a greater demand to interpret social cues. A child may cope academically while finding those demands exhausting.

You might notice difficulties joining play, understanding implied instructions or coping with a noisy classroom. Some children appear settled at school but need a long recovery at home. Others struggle with transitions or become very focused on a particular topic.

Ask teachers what they observe without assuming that one setting tells the whole story. Girls can be overlooked, and interests or communication styles do not always match common stereotypes. An assessment should consider experiences across home, school and other familiar places.

Loss of skills needs prompt attention

If your child stops using words, gestures, social responses or other skills they previously used, contact your local medical or child development service promptly. Do not assume it is simply a phase or wait for an online checklist to become clearer.

Loss of skills has several possible explanations and needs professional assessment. Describe which skills changed, when you first noticed the change and whether there are other symptoms. This is not a situation to manage through a blog or a routine WhatsApp enquiry alone.

Make your observations useful

A short record can help you explain concerns. Write concrete examples such as what happened during a meal, a game or a school transition. Include situations that went well. Your child's comfort, interests and communication methods are as important as the difficulties.

Short videos from ordinary activities may help a professional if they request them, but never share private material publicly or send it to an unfamiliar service. Ask the assessment team how they want information shared and whether they need it at all.

Bring your questions about hearing, language and development. You do not need a perfectly organised file or a persuasive case before asking for an appointment.

Support can start with the need

Language support, predictable routines and sensory adjustments can be discussed while assessment is being arranged. The right support responds to what the child needs now rather than waiting for every question to be answered. Our programme is separate from diagnosis and reviews existing information.

Talk when you are ready

Bangkok Autism Care does not diagnose autism, but we can guide you on seeking an assessment and discuss an existing report. If you would like a calm conversation about next steps, use the WhatsApp button or send us an enquiry. For urgent concerns or lost skills, contact your local medical service first.