Why Behaviours Happen: Understanding the Function of Behaviour in Children

Apr 13

4 min read

Updated: 20 hours ago

Written by Eugene Tng, QASP-S, Programme Director at ABA LABS

When a child displays challenging behaviour, it is easy to focus on stopping the behaviour as quickly as possible. Parents may wonder why the behaviour keeps happening, especially when boundaries, reminders, or consequences are already in place.

To support real progress, it helps to understand one key idea:behaviour happens for a reason.

In early intervention, behaviour is viewed as meaningful information rather than something random or intentional. Behaviour Is a Form of Communication

For young children, behaviour is often the most effective way they know how to communicate.

When children lack the skills to:

express needs verbally
manage frustration
cope with demands
understand expectations

behaviour becomes their way of communicating discomfort, confusion, or unmet needs.

This does not mean children are being manipulative or deliberately difficult. It means they are using the tools they currently have. What Is the “Function of Behaviour”?

In behaviour therapy, the function of behaviour refers to why a behaviour occurs, what the child gains or avoids by engaging in it.

Most behaviours serve one (or more) of the following functions:

gaining attention
accessing a preferred item or activity
escaping or avoiding a demand
seeking sensory input or relief

Understanding the function helps professionals determine how to support the child more effectively. Why Stopping Behaviour Alone Often Doesn’t Work

If intervention focuses only on stopping a behaviour without addressing its function, the behaviour may:

reappear in another form
resurface in a different setting
increase in intensity over time

This is because the child’s underlying need remains unmet.

For example, if a child engages in tantrums to escape a difficult task, removing the tantrum without teaching an alternative way to cope does not solve the original challenge. Skill Gaps Often Drive Behaviour

Many behaviours occur because a child does not yet have the skills needed to handle a situation.

These skill gaps may include:

communication skills
emotional regulation
flexibility
task tolerance
understanding instructions

When these skills are taught, behaviour often improves naturally.

This is why effective early intervention focuses on skill-building, not just behaviour reduction. Behaviour Can Change as Skills Develop

As children learn:

how to ask for help
how to express feelings
how to tolerate challenges
how to understand routines

they rely less on challenging behaviour to communicate their needs.

Behaviour change becomes a by-product of learning, rather than the sole goal of intervention. Understanding Behaviour Helps Parents Respond More Effectively

When parents understand why a behaviour is happening, it becomes easier to respond calmly and consistently.

Instead of asking:

“How do I stop this behaviour?”

the focus shifts to:

“What is my child trying to communicate or avoid?”

This perspective supports more effective, compassionate responses that help children learn appropriate alternatives. How Early Intervention Addresses the Function of Behaviour

Early intervention uses structured strategies to:

identify why behaviours occur
teach alternative, functional skills
reduce reliance on challenging behaviour
support learning across settings

By addressing both behaviour and the skills behind it, intervention becomes more meaningful and sustainable. How ABA LABS Approaches Behaviour Understanding

At ABA LABS, behaviour is viewed as part of a child’s learning process.

Our approach focuses on:

understanding each child’s needs
identifying skill gaps
teaching functional alternatives
supporting families through consistent strategies

By addressing the function of behaviour, we aim to support long-term development rather than short-term fixes. Final Thoughts

Behaviours do not happen without reason. When we understand why a behaviour occurs, we are better equipped to support children in learning new, more effective ways to communicate and cope.

Understanding behaviour is not about blame, it is about building skills. Taking the Next Step

Noticing that your child may need extra support can feel overwhelming, but it is also an important first step towards helping them thrive.

With the right guidance and intervention, many children make meaningful progress in communication, behaviour, and independence.

If you would like to better understand your child’s development and explore support options, speaking with a professional can provide clarity and direction. Want a full understanding of early intervention and how to support your child’s development? Read our complete guide here: Complete Guide to Early Intervention in Singapore

Keep reading: Behaviour therapy at home | Free milestone checklist | Our early intervention programme

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Frequently Asked Questions

Why does my child keep misbehaving even after I set consequences?

Behaviour usually happens for a reason. If a consequence stops the behaviour but the need behind it is still unmet, the behaviour may come back in another form, in a different setting, or more intensely. Looking at what your child gains or avoids, and teaching a better way to meet that need, tends to work better than consequences alone.

What are the four functions of behaviour?

Most behaviours serve one or more of four purposes: gaining attention, getting a preferred item or activity, escaping or avoiding a demand, and seeking sensory input or relief. Knowing which one is driving a behaviour helps parents and professionals choose a response that actually helps, rather than guessing or simply trying to stop it.

Is my child being manipulative when they act up?

Usually not. For young children, behaviour is often the most effective way they know to communicate. When they lack the words to ask for help, manage frustration or understand what is expected, they use the tools they currently have. As those skills are taught, children tend to rely less on challenging behaviour to get their needs met.