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Signs of ADHD in Children: What Parents Often Miss (Beyond Hyperactivity)

When most people picture ADHD, they picture a child who can’t sit still: running, climbing, calling out in class. That child does exist. But many children with ADHD look nothing like that picture.

Some are quiet and dreamy. Some work incredibly hard to hold it together at school and fall apart at home. Some are bright, creative, and kind, yet always seem to lose their things, miss instructions, or run out of time. Because these signs are easy to overlook, ADHD in children is often missed or identified late, especially in girls.

This guide walks through the signs of ADHD in children that parents and teachers commonly miss, what an ADHD assessment involves, and how families can get the right support.

Key Takeaways

•         ADHD is a neurodevelopmental difference in attention, activity levels, impulse control, and executive functioning. It is not a result of poor parenting or a lack of effort
•         There are three presentations: inattentive, hyperactive-impulsive, and combined
•         Many children, can have the inattentive presentation and are easily overlooked
•         Big emotions, forgetfulness, and difficulty starting tasks are common signs that often go unrecognised
•         ADHD can look like anxiety, learning difficulties, or “behaviour problems”, so a thorough assessment matters
•         With understanding and the right strategies, children with ADHD can thrive and use their strengths

What Is ADHD?

ADHD stands for Attention-Deficit/Hyperactivity Disorder. It is a neurodevelopmental condition, which means a child’s brain develops and works a little differently when it comes to regulating attention, energy, and impulses.

The name is a bit misleading. Children with ADHD don’t have a deficit of attention. They often have plenty of it. The difficulty is in regulating it. A child might hyperfocus on a favourite game for hours but struggle to start homework, listen to a list of instructions, or switch from one activity to the next.

There are three presentations:

•         Predominantly inattentive: difficulty sustaining focus, getting easily distracted and difficulties following through
•         Predominantly hyperactive-impulsive: high energy, restlessness, and acting before thinking
•         Combined: a mix of both

Signs of ADHD That Are Often Missed

Some signs are obvious. Others are subtle, and easy to misread as laziness, defiance, or a “personality quirk”.

What you might see	What may be happening underneath
Constantly losing things (jumper, drink bottle, homework)	Getting easily distracted and difficulty with organisation
“Not listening” or needing instructions repeated	Attention drifting, especially when information is long or not interesting
Homework that takes hours, or never gets started	Trouble with task initiation and sustained effort, not unwillingness
Daydreaming or seeming “in their own world”	Inattentive presentation, often missed because it isn’t disruptive
Big reactions to small frustrations	Difficulty regulating emotions and managing disappointment
Interrupting, blurting out, or struggling to wait their turn	Impulse control differences
Running late, losing track of time	Time blindness, a common executive functioning challenge
Perfectionism or avoiding tasks	Fear of getting it wrong after years of criticism or struggling to keep up
Falling apart after school	Exhaustion from holding it together all day

If you see yourself nodding along, it doesn’t mean your child definitely has ADHD. It does mean it’s worth having a conversation with a professional.

ADHD in Girls: Why It Is So Often Overlooked

Historically, ADHD research and diagnostic descriptions focused on hyperactive boys. As a result, girls with ADHD have often been missed, sometimes until adolescence or adulthood.

Girls are more likely to have the inattentive presentation, and many learn to compensate. They might work extra hard, copy their peers, rely on routines, or stay quiet to avoid attention. Instead of being identified as having ADHD, they may be described as “shy”, “sensitive”, “disorganised”, or “not living up to their potential”. Many are first assessed for anxiety or low mood, when ADHD is part of the picture.

This is not unique to girls. Any child who masks their difficulties can slip under the radar.

What ADHD Can Look Like at Different Ages

Preschool: very high energy, difficulty with group time, frequent emotional outbursts, constant movement

Primary school: trouble finishing work, messy bags and desks, forgetfulness, difficulty with friendships, big emotional reactions, falling behind despite being clearly capable

High school: struggling with the increased demands for organisation and independence, procrastination, missing deadlines, restlessness (often internal), low confidence

As expectations rise, difficulties that were once manageable can become more visible, which is why ADHD is sometimes identified during the transition to high school.

Is It ADHD, or Something Else?

ADHD can look like other things, and other things can look like ADHD. Difficulties with attention and behaviour can also be linked to:

• Anxiety, which can make it hard to concentrate
• Learning difficulties, such as dyslexia, where focus drops because the work is genuinely hard
• Poor sleep, which affects attention and mood in children
• Stress or trauma
• Autism or other neurodevelopmental conditions that can have some overlapping symptoms

In fact, many children have more than one thing going on. To find out more, you can read our guides on AuADHD and PDA in children and autism assessment for children in Sydney.

That is exactly why a careful, whole-child assessment is so valuable.

What Does an ADHD Assessment Involve?

An ADHD assessment is much more than a checklist. At SCPS, a comprehensive assessment aims to understand your child’s whole story, and typically considers:

•  A detailed conversation with parents about your child’s development, history, strengths, and challenges
• Cognitive and Learning Ability assessments.
• Questionnaires and rating scales completed by parents and, where possible, teachers
• Direct work with your child, including observation of attention, learning, and emotional functioning
• Information from school and other professionals when relevant
• Consideration of other possible explanations or co-occurring conditions, such as anxiety, learning difficulties, or autism

The goal isn’t just to give a label. It is to understand how your child’s mind works, so you can find strategies that help. Where medication might be considered, this is a decision made with your child’s paediatrician, psychiatrist, or GP, and we work collaboratively with them.

Supporting a Child With ADHD

Support works best when it focuses on strengths as well as challenges. Helpful approaches often include:

• Understanding and reframing: knowing that your child is not choosing to be forgetful or disorganised helps everyone respond with more patience
• Practical strategies: visual schedules, checklists, breaking tasks into small steps, timers, and routines that reduce the load on working memory
• Parent support: learning how to give clear instructions, build in movement, and use positive feedback that motivates
• Emotional skills: helping children name feelings and build ways to calm and recover
• School collaboration: classroom adjustments such as seating, movement breaks, chunked instructions, and extra processing time
• A neurodiversity-affirming approach: celebrating your child’s creativity, curiosity, energy, and passion, rather than trying to make them fit a mould

Many children with ADHD are imaginative, funny, determined, and deeply caring. With the right understanding, those strengths have room to shine.

Frequently Asked Questions

At what age can ADHD be assessed? ADHD can be assessed from early childhood through to adolescence and adulthood. Signs are often noticed in the primary school years, when attention and organisation demands increase. A psychologist can help you work out whether an assessment is right at this stage.

Can a child have ADHD without being hyperactive? Yes. The inattentive presentation of ADHD doesn’t involve obvious hyperactivity, and it is the presentation most often missed, particularly in girls.

Does my child’s good behaviour at school mean it isn’t ADHD? Not necessarily. Some children hold it together at school and then release it at home. Your observations as a parent are valuable.

Is ADHD caused by screen time or parenting? No. ADHD is strongly influenced by genetics and brain development. Parenting and the environment don’t cause it, but they can make a big difference to how well a child is supported.

Do you offer telehealth? Yes. Telehealth therapy appointments are available across New South Wales and Australia. However assessments are conducted in person at the clinic.

Getting Clarity for Your Child in Sydney

If you’re wondering whether your child’s struggles might be ADHD, you don’t have to work it out alone. A thorough assessment can bring clarity, relief, and a practical path forward.

At Sydney Child Psychology Services (SCPS), our registered child psychologists provide evidence-based, neurodiversity-affirming assessment and support for children and adolescents at our Croydon Park clinic in Sydney’s inner west, with telehealth appointments available across New South Wales.

SCPS is not an emergency or crisis service. If you or your child are in crisis, please contact Lifeline on 13 11 14 or Kids Helpline on 1800 55 1800. In an emergency, call 000.