The International Dysphagia Diet Standardisation Initiative (IDDSI) framework was designed to apply across the full lifespan — from premature infants to older adults. Yet implementing IDDSI in paediatric care requires adjustments that go beyond simply scaling down adult practice. Age, developmental stage, neurological maturity, and the physiological differences between an infant’s swallow and an adult’s all shape how clinicians select levels, test textures, and counsel families.

Why Paediatric IDDSI Implementation Differs

Adult dysphagia management typically centres on rehabilitation — restoring function after stroke, surgery, or progressive neurological disease. Paediatric dysphagia, by contrast, often occurs against a backdrop of development. Infants and young children are simultaneously learning to eat for the first time. The goal is not only safe swallowing but also the acquisition of age-appropriate oral feeding skills.

This developmental context has direct implications for IDDSI level selection:

• Infants under 6 months are physiologically limited to liquid nutrition (IDDSI Level 0–2). Introducing textures before the oromotor system is ready is inappropriate regardless of IDDSI framework.
• 6–12 months is a critical window for transitioning through purée (Level 4) toward mashed and lumpy textures (Level 5–6), mirroring typical complementary feeding progression.
• Toddlers and school-age children may need level adjustments based on dentition, cognitive capacity to manage mixed textures, and fatigue during meals.

A child who is assigned a long-term IDDSI level without regular reassessment risks missing developmental windows for texture advancement — a harm that has no direct equivalent in adult practice.

IDDSI Level Considerations by Age Group

Infants (0–12 months)

Breast milk and standard infant formula are Level 0 thin liquids. Where thickening is clinically indicated (e.g., in infants with laryngomalacia or post-operative reflux), care must be taken: most commercial thickeners are not validated for use in infants under 12 months, and some starch-based products have been associated with necrotising enterocolitis in premature neonates. The Hong Kong Children’s Hospital (HKCH) and HA paediatric SLT services follow unit-specific protocols for infant thickening — always defer to local guidance.

Purées at Level 4 are appropriate from around 6 months as a starting texture for complementary foods, not as a dysphagia modification per se.

Toddlers (1–3 years)

The flow test and fork pressure test used to verify IDDSI levels are calibrated for standard utensils. For toddlers who eat with smaller cutlery, clinicians should use child-sized forks and spoons in testing. Texture rejection is common at this age for sensory rather than safety reasons — careful clinical differentiation is needed.

School-age children (4–12 years)

Children in this group are often more able to self-report difficulty with specific textures. IDDSI levels can be tailored to settings: a child may safely manage Level 6 at home with parental supervision but require Level 5 in a school canteen where supervision is limited.

Testing Methods: Adaptations for Paediatric Settings

Standard IDDSI testing (flow test, spoon tilt, fork pressure) applies to paediatric practice, but with considerations:

• Volume modifications: Infants consume smaller boluses. Testing viscosity with adult volumes may not reflect actual ingestion conditions.
• Temperature sensitivity: Young children are often highly sensitive to temperature; test textures at the temperature they will actually be served.
• Developmental texture assessment: Tools such as the Paediatric Assessment Scale for Severe Feeding Problems (PASSFP) and the Schedule for Oral-Motor Assessment (SOMA) complement IDDSI level determination by quantifying oromotor skill.

IDDSI in Hong Kong Paediatric Services

Hong Kong’s Child Assessment Service (CAS), operated under the Department of Health, provides multidisciplinary assessment for children with developmental concerns including feeding difficulties. SLTs within CAS routinely apply IDDSI in their recommendations, coordinating with dietitians to ensure nutritional adequacy when texture modification is required.

At the Hong Kong Children’s Hospital, the paediatric SLT team integrates IDDSI documentation into discharge planning, ensuring families receive written texture descriptors, IDDSI symbols, and demonstration of flow testing before going home.

Community paediatricians and school nurses are increasingly familiar with IDDSI terminology, facilitating communication between the hospital and school or home settings.

Communicating IDDSI to Families

Parental engagement is central to paediatric IDDSI implementation. Key principles:

1. Use IDDSI symbols alongside words — young children and carers from non-English-speaking backgrounds benefit from visual cues.
2. Demonstrate texture preparation — a written prescription alone is insufficient. Hands-on kitchen sessions with a dietitian or SLT reduce preparation errors.
3. Set review dates — document that the IDDSI level is not permanent and schedule reassessment at developmentally appropriate intervals (typically every 3–6 months in growing children).
4. Address sensory concerns — many families misattribute sensory-based refusal to the texture level itself. SLT guidance on mealtime environment and desensitisation strategies reduces unnecessary level restriction.

When IDDSI Levels Should Be Advanced

A key difference from adult practice: in paediatrics, the clinical question is not only “is this level safe?” but also “is this level limiting development?” Signs that a child may be ready for texture advancement include:

• Consistently tolerating current level without coughing, choking, or wet vocal quality
• Emerging molar dentition (for solid texture progression)
• Increased interest in family foods at the current level’s boundary
• Improved oromotor examination findings on formal SLT review

Advancement should always follow instrumental assessment (videofluoroscopic swallowing study or FEES) where clinical concern exists, rather than relying on caregiver report alone.

Conclusion

IDDSI provides a common language that benefits paediatric dysphagia management enormously — particularly when children move between hospital, school, and home settings. Successful implementation depends on understanding where paediatric practice diverges from adult norms: in developmental framing, age-specific level selection, adapted testing, and family-centred education. Clinicians new to paediatric dysphagia should seek supervision from experienced paediatric SLTs and consult local service protocols before applying IDDSI levels in clinical practice.