As a clinical psychologist, this is one of the most common — and most important — questions I hear. Here is what I wish every parent knew before they spiral into worry.

“The moment you find yourself Googling your child’s behaviour at 2am, your heart hammering — I want you to know that asking the question is not a failure. It is one of the most loving things a parent can do.”

In my clinic, parents arrive with notebooks full of observations, screenshots of forums, and expressions caught somewhere between hope and dread. They have usually been worrying in silence for months — sometimes years — before they finally say the words aloud: “Do you think my child has autism?”

Before I answer anything else, I always say the same thing: noticing differences in your child is not the same as catastrophising. It is attentiveness. And attentiveness, acted on early, is the single biggest predictor of good outcomes for autistic children.

First, what is autism — really?

Autism Spectrum Disorder (ASD) is a neurodevelopmental condition characterised by differences in social communication and interaction, alongside restricted or repetitive patterns of behaviour, interests, or sensory responses. The word “spectrum” is critical here: autism is not one single presentation. It is a vast, varied landscape.

Some autistic children speak in full sentences at age two but struggle to read a room. Others do not speak at all. Some are academically gifted; others need significant support across every area of daily life. Many autistic people live independently, build careers and relationships, and thrive. Autism is not a tragedy — but unidentified and unsupported autism can lead to a great deal of unnecessary struggle.

Signs by age — what to look for

No single sign tells the full story. Autism is a pattern of differences across multiple areas of development, observed over time. Here is what the research and clinical practice tell us to watch for, broken down by age:

• 0–18 months
• 18 months–3 yrs
• 3–7 years
• 8+ years

What these signs don’t mean

I want to be direct about something I see cause enormous guilt in parents: none of these signs are caused by parenting. Autism is neurodevelopmental — it arises from a complex interplay of genetics and early brain development. You did not cause it by returning to work, by using a dummy, by screen time, or by anything else.

I also want to gently push back on a fear I hear constantly: that getting an assessment means “labelling” your child. In my experience, the children who suffer most are not the ones with a diagnosis — they are the ones whose differences are noticed by everyone but never named or understood. A diagnosis does not limit a child. It opens doors: to support, to understanding, and crucially, to a child understanding themselves.

What to do if you’re concerned

1. Write things down.Keep a diary for two to four weeks. Note specific behaviours, how often they occur, in what contexts, and how your child responds. Concrete observations are far more useful to a clinician than general impressions.
2. Speak to your GP or health visitor first.In the UK, your GP can refer you to a community paediatric team or a Child and Adolescent Mental Health Service (CAMHS) for a developmental assessment. Be specific about what you have observed.
3. Talk to your child’s school.Teachers see children in a structured social environment you rarely witness. Their observations are clinically valuable. Ask whether the school’s SENCO (Special Educational Needs Coordinator) has any concerns.
4. Seek a multi-disciplinary assessment.A gold-standard autism assessment typically involves a paediatrician or psychiatrist, a psychologist, and often a speech and language therapist. It takes time — but it is thorough.
5. Explore private assessment if waiting lists are long.NHS waiting times for autism assessment in the UK currently average two to three years in many areas. Reputable private clinicians can often assess within months. Ensure any private assessment follows NICE guidelines.

While you wait — what actually helps

A diagnosis can take time. That does not mean you wait passively. The following approaches have strong evidence for supporting neurodivergent children — and frankly, most of them are simply good parenting for any child.

• Follow their interests
• Many autistic children find it easier to understand feelings when they are named clearly: “I can see you are frustrated. That was unexpected and it felt unfair.”
• Name emotions explicitly
• A child’s deep interest is not a problem to manage — it is a bridge. Use it to connect, to teach, and to build confidence.
• Visual schedules, consistent daily structures, and advance notice of changes dramatically reduce anxiety in children who struggle with unpredictability.
• Predictable routines
• Protect recovery time
• Social engagement is effortful for many autistic children. Quiet, undemanding time at home is not wasted time — it is essential restoration.