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Knowledge base

Developmental considerations in SCN2A-related disorders and the broader DEE community.

Children with SCN2A-related conditions and other forms of DEE may experience a broad range of developmental differences, in how they communicate, move, learn, behave, and experience the world. The nature and degree vary significantly, even among children with the same genetic condition.

The big picture

Why developmental support matters, even when seizures are controlled.

In developmental and epileptic encephalopathies, the underlying gene change affects how the brain develops, not just how it generates seizure activity. Developmental differences in children with DEE are not simply a secondary effect of seizures; they are part of the condition itself.

This distinction matters because it means that even when seizures are well controlled, developmental support remains important. Conversely, accessing developmental therapies early, before or alongside seizure treatment, is genuinely valuable and not something to be deferred.

The range across the SCN2A community is wide. Some children have significant intellectual disability and complex communication needs; others have mild developmental differences alongside good language and social development. Where your child sits depends on their specific variant, the timing and nature of any seizure activity, and many individual factors.

Areas of development

What may be affected.

Communication and language
Many children with SCN2A and DEE experience delays in language development. Speech pathology is one of the most important early interventions, access to an experienced paediatric speech pathologist should be pursued as early as possible. Some children, particularly those with loss-of-function variants, benefit from AAC (alternative and augmentative communication) supports.
Motor development
Common: hypotonia (low muscle tone), delays in gross motor milestones (sitting, crawling, walking), fine motor difficulties (handwriting, cutlery), and ataxia. Physiotherapy supports gross motor; occupational therapy supports fine motor and daily living skills.
Cognitive development and learning
Many children experience some degree of intellectual disability or learning difficulty, though the degree varies considerably. Challenges may include attention, processing speed, memory, abstract reasoning, and transitions.
Autism spectrum features
ASD features are particularly common in children with SCN2A loss-of-function variants. Some have a dual SCN2A + ASD diagnosis. It is important to understand autism in the context of a genetic condition as part of a complex neurodevelopmental picture, not a separate, unrelated diagnosis.
Behaviour
Behavioural challenges are common and often connected to underlying communication difficulties, sensory sensitivities, pain, sleep disturbance, or seizure activity. Understanding what the child is communicating or responding to is more useful than trying to eliminate the behaviour.
Sleep
Sleep disturbance is reported by the majority of SCN2A families. It is not simply a parenting challenge, it often has neurological and physiological causes. Raise sleep concerns with your child's neurologist or developmental paediatrician.
Feeding and gastrointestinal
Feeding difficulties (sucking and swallowing in infancy, texture aversions, reflux) and constipation are reported by many families. A paediatric speech pathologist can assess feeding and swallowing; a dietitian may also help.
Early intervention

The earlier, the better, but never too late.

Research consistently shows that early intervention, accessing therapies and developmental support as early as possible, leads to better outcomes for children with neurodevelopmental conditions.

For children under 9, the NDIS Early Childhood Approach provides a pathway to early funded supports without requiring a formal NDIS plan. For older children, NDIS funding through a standard plan can cover therapy costs.

Early intervention typically involves some or all of the following, depending on the child's needs:

  • Occupational therapy, daily living, fine motor, sensory processing, school readiness
  • Speech pathology, communication (including AAC), language, feeding and swallowing
  • Physiotherapy, gross motor, mobility, posture, movement
  • Psychology, cognitive assessment, learning strategies, emotional and behavioural support for child and family
  • Early childhood intervention programmes, multidisciplinary teams, often in home or community settings

The earlier these supports begin, the more the developing brain can benefit. This does not mean that intervention after early childhood is not valuable, it is, but early access tends to have the greatest developmental impact.

School

Education and school.

Supporting a child with SCN2A or DEE through school requires collaboration between the family, the school, and the child's therapeutic team. Most states and territories have provisions for additional educational support, including:

  • Adjusted learning goals and curriculum modifications
  • Teacher aides or integration aides (funded through state education departments or NDIS)
  • Access to assistive technology (communication devices, computer-based learning tools)
  • Specialist school settings for children with higher support needs

Many families find that advocating effectively requires persistence and clear documentation from the child's treating team. OTs, speech pathologists, and psychologists can provide written reports that support access to school-based funding and adjustments.

SCN2A Australia can help you navigate the school support landscape and connect you with families who have experience advocating in your state or territory.

Looking ahead

Planning for adulthood.

For families with older children and young people with SCN2A or DEE, thinking ahead to adulthood is an important and often daunting process. Questions about post-school options, supported living, employment, and adult health care are ones that many families begin confronting in the teenage years.

SCN2A Australia is developing resources for this stage. In the meantime, we encourage families to:

  • Begin discussions with your child's NDIS support coordinator about transition planning well before school leaving age
  • Ask your medical team about transition to adult services
  • Connect with other families navigating this stage through our peer network
Children with SCN2A and DEE surprise their families, their therapists, and their doctors. The right support, the right team, and the right community around your family makes a genuine difference.
A reminder we hold onto.