An Introduction to Developing Communication Skills in Children with Intellectual Disabilities

Every child has an innate need to communicate – to express hunger, joy, pain, curiosity, or simply the desire to connect with another person. For most children, this ability develops naturally through a predictable sequence of milestones: babbling as infants, forming single words, then sentences, and eventually engaging in full conversation. But for children with intellectual disabilities, this journey is rarely straightforward. Communication is not just a developmental milestone for these children – it is one of their primary challenges, and addressing it requires deliberate, well-informed, and compassionate support. Understanding what communication truly involves, and how intellectual disability affects it, is the essential first step for any educator, therapist, or caregiver working in this space.

What communication actually means 🔗

According to research published by the NIH, communication comprises all verbal and nonverbal means used to transmit information between individuals – encompassing language, speech, gesture, body language, and facial expression. It is, at its core, an exchange of messages. And like any exchange, it has two equally important sides: the ability to send a message and the ability to receive one.

These two sides are known as expressive communication and receptive communication. Expressive abilities allow a person to convey meanings to others, while receptive abilities allow them to understand what others are communicating. Both dimensions matter equally. A child who can speak a few words but cannot understand what is being said to them will still struggle significantly in daily interactions. Similarly, a child who understands everything but cannot express themselves will face enormous frustration.

Communication can take two broad forms:

• Verbal communication – the use of spoken words, language, and writing to convey messages
• Non-verbal communication – the use of gestures, facial expressions, eye contact, body movements, vocalisations, and symbols to communicate

As noted by the Intellectual Disability Mental Health Connect resource, behaviour itself is a form of non-verbal communication and can be a rich source of expressive information – a fact that is especially relevant when working with children who have limited or no speech. Understanding this broader definition of communication is essential before attempting any intervention.

Communication challenges in children with intellectual disabilities 🔗

In a typically developing child, communication follows a predictable path – from gestures and vocalisations in infancy, through the gradual emergence of words, sentences, and conversational ability. For children with intellectual disabilities, however, this process is frequently delayed, requiring individualised support to develop effective communication. The extent of the delay and the type of difficulty varies considerably depending on the severity of the intellectual disability.

Most individuals with intellectual disabilities are able to develop functional communication skills, though they often show delays in reaching developmental milestones and face specific difficulties within different components of language. Pragmatic skills – such as understanding the social context of a conversation or knowing when to speak – are also areas of relative difficulty for many of these children.

It is important to understand that communication difficulties exist on a spectrum. While children with mild intellectual disabilities are likely to have sufficient expressive and receptive language skills to verbally participate in conversations, those with moderate to profound levels may rely on methods other than speech altogether. This range means that no single intervention approach can work for every child – personalised assessment and planning are always necessary.

Receptive vs. expressive difficulties 🔗

Impaired receptive and expressive language commonly co-occur in children with intellectual and language difficulties, and difficulties with comprehension in particular are a significant red flag for ongoing language challenges. Educators and caregivers are sometimes tempted to assume comprehension because a child appears to follow instructions – but context often does the heavy lifting. A child might correctly respond to “Come and have lunch” not because they understood the words, but because they saw the table being set. Distinguishing genuine language comprehension from contextual cues is a crucial, and often underappreciated, part of assessment.

The role of associated disabilities in speech development 🔗

Intellectual disability rarely exists in isolation. Many children who have an intellectual disability also live with one or more co-occurring conditions, and these associated disabilities can significantly complicate the development of speech and communication.

Conditions related to intellectual and developmental disabilities can cause additional issues including behavioural disorders, speech or language difficulties, seizures, and challenges with movement. Key conditions that frequently co-occur and directly affect communication include:

Cerebral palsy 🔗

Cerebral palsy can affect the ability to coordinate the muscles of the mouth and tongue needed for speech, as well as the respiratory coordination that supports it – in some cases leaving individuals completely unable to produce sounds, and in others making speech unclear to listeners. Around one in four people with cerebral palsy cannot talk. When cerebral palsy co-occurs with intellectual disability, the combination presents a compounded communication challenge that requires both motor-focused and cognitive-focused interventions simultaneously.

Hearing impairment 🔗

A child cannot easily learn to speak sounds they cannot hear. Hearing impairments can significantly affect a child’s speech and language development, cognitive progress, and psychosocial wellbeing. For children who already have an intellectual disability, the addition of even a moderate hearing loss can substantially deepen their communication difficulties. For children with intellectual disability and impaired language, there is also a risk of reduced hearing over time, so hearing must be monitored regularly.

Autism spectrum disorder 🔗

Language delays and disorders are common in autism spectrum disorder, and the presence of ASD is important to consider given the significant benefits of early language intervention. When ASD co-occurs with intellectual disability, communication difficulties extend beyond delayed speech to include challenges with the social and pragmatic use of language – making it harder for children to initiate conversation, take turns, or interpret social cues.

Sensory and other impairments 🔗

Children with intellectual disabilities frequently have other, additional, disabling conditions including physical disabilities, sensory impairments, sensory processing difficulties, and complex health needs – all of which compound the difficulty of communication. Vision impairment, for instance, removes crucial non-verbal cues that children rely on to understand and initiate interaction. Each additional condition layers further complexity onto the communication picture, making a holistic and multi-disciplinary approach to assessment and intervention not just helpful, but essential.

Stages of communication development: from pre-intentional to symbolic 🔗

Understanding where a child currently sits on the communication continuum is foundational to any support strategy. The communication skills of people with intellectual disabilities can broadly be divided into three developmental categories: pre-symbolic, symbolic, and verbal.

At the pre-intentional stage, a child does not yet understand that their actions can influence others – communication happens through involuntary responses such as crying, changes in muscle tension, or altered breathing patterns. At the intentional stage, a child begins to realise they can use specific behaviours – pointing, reaching, vocalising – to influence those around them. At the symbolic stage, the child uses agreed-upon symbols, whether spoken words, written language, pictures, or signs, to communicate meaning that goes beyond the immediate environment.

Not all children with intellectual disabilities will progress through these stages in a neat linear order, and not all will reach full verbal communication. Not all children develop communication at the same rate or following clear stages, and communication difficulties can also make behaviours that challenge more likely to occur. Recognising the stage a child is currently at allows educators and caregivers to meet them where they are, rather than setting goals that are misaligned with their current capacity.

Non-verbal communication as a vital alternative 🔗

One of the most important shifts in the field of communication support has been the recognition that speech is not the only valid form of communication – and that targeting speech at the expense of all other modes can actually leave children without a functional means of expression for years.

About 60% of people with intellectual disabilities are able to use symbolic methods such as pictures, symbols, signs, or speech to communicate. For the remaining 40%, especially those with severe or profound intellectual disabilities, non-verbal methods become the primary – and sometimes only – channel of meaningful communication.

The main non-verbal methods used in intervention include manual signs, Picture Exchange Communication Systems (PECS), and Speech Generating Devices (SGDs), all of which have a substantial body of literature supporting their applicability and benefits.

Augmentative and Alternative Communication (AAC) is the umbrella term for this range of tools and strategies. AAC interventions for children with intellectual and developmental disabilities increase functional communication skills, improve language and social competence, and in some individuals, can actually support the development of natural speech. This last point is particularly important: providing AAC does not prevent a child from developing speech. In many cases, it supports it.

Research consistently supports intervening with younger children rather than waiting for natural speech to emerge before beginning AAC interventions. Delaying communication support while hoping speech will arrive on its own can lead to years of frustration, increased challenging behaviour, and missed developmental windows.

Manual signing systems such as Makaton use signs taken from sign language alongside simplified speech to support understanding and aid expression – with only the most important words in each sentence being signed. These systems are especially useful for children who have enough motor control to produce signs but have not yet developed intelligible speech.

Why a holistic approach matters 🔗

Given the range of challenges that can affect a child’s ability to communicate, no single-track approach will ever be sufficient. A multidisciplinary approach ensures comprehensive care for children with intellectual disabilities and speech delays. Collaboration among paediatricians, psychologists, special educators, speech-language pathologists, and occupational and physical therapists allows for a well-rounded support system.

Person-centred communication – which keeps the individual at the core of decision-making processes and ensures their involvement and empowerment – is a cornerstone of effective practice. This means assessing each child’s unique communication profile, identifying their strengths alongside their difficulties, and designing an intervention plan that builds on what the child can already do.

Family involvement is equally non-negotiable. Equipping families with strategies and tools they can use at home ensures that children have consistent support and opportunities for practice across all environments – not just within the therapy room or classroom. Communication development happens in context, and the most powerful context for a young child is their everyday life.

Social and communication skills are also deeply intertwined. For individuals with intellectual disability, delays in these skills alter developmental trajectories and make their interrelations even more complex and important for effective intervention. This is why communication support cannot be siloed – it must be integrated into the child’s broader social and educational development.

The goal: functional communication, not just speech 🔗

Developing communication skills in children with intellectual disabilities is ultimately about enabling them to participate fully in their own lives – to make choices, express needs, build relationships, and engage with the world around them. Speech is one powerful way of doing that. But it is not the only way, and for many children, it will not be the primary way.

The focus of evidence-based practice in this area is therefore on developing functional communication – whatever form that takes for the individual child. This means recognising the value of every communicative act, whether it is a pointed finger, a symbol card, a digital device, or a spoken word. The ability to effectively and efficiently communicate wants and needs, and to actively participate in social exchanges, can significantly improve quality of life and independence for children with intellectual disabilities.

Strategies for building speech – and for supplementing or replacing it with non-verbal communication methods – form the practical backbone of any intervention programme. Understanding the nature of communication, the specific challenges intellectual disability presents, and the additional complications introduced by associated conditions, is what makes those strategies coherent and effective.

What do you think? Given that children with intellectual disabilities may never develop conventional speech, how should educators and families reframe their definition of “communication success”? And considering how many associated conditions can compound communication difficulties, what does a truly holistic support plan look like in a real classroom or home setting?

References

1. https://pmc.ncbi.nlm.nih.gov/articles/PMC5801738/
2. https://cerebra.org.uk/wp-content/uploads/2021/11/Communication-1.pdf
3. https://idmhconnect.health/i-am-professional/meeting-mental-health-needs-people-intellectual-disability/communication
4. https://behaviourhelp.com/behaviour-blog/conditions-and-disorders/practical-skills-and-strategies-for-supporting-communication-development-for-those-with-intellectual-and-developmental-disabilities
5. https://my.vanderbilt.edu/speds2430/2020-topics/intellectual-disabilties/
6. https://www.nichd.nih.gov/health/topics/idds/conditioninfo
7. https://cparf.org/what-is-cerebral-palsy/how-does-cerebral-palsy-affect-people/
8. https://www.physio-pedia.com/Cerebral_Palsy_and_Associated_Conditions
9. https://www.cambridge.org/core/journals/advances-in-psychiatric-treatment/article/communicating-with-people-with-intellectual-disabilities-a-guide-for-general-psychiatrists/7CDBE09DC1B7AA63700A5031B9319E39
10. https://pmc.ncbi.nlm.nih.gov/articles/PMC10568128/
11. https://pmc.ncbi.nlm.nih.gov/articles/PMC8009928/
12. https://connectedspeechpathology.com/blog/a-guide-to-intellectual-disability-and-speech-delay-in-children
13. https://www.kutestkids.com/blog/communication-strategies-for-children-with-intellectual-disability
14. https://trudeaucenter.org/empowering-communication-strategies-for-promoting-language-skills-in-children-with-intellectual-disabilities-at-j-arthur-trudeau-memorial-center/
15. https://www.sciencedirect.com/science/chapter/bookseries/abs/pii/S2211609523000064