Early Intervention Strategies in Williams Syndrome: A Case Report of Multimodal Therapeutic Approach in a 3-Year-Old Child

Patient information

A 3-year-old female from an urban area was referred for developmental assessment due to concerns regarding language development and behavioural manifestations. The patient was the first-born child of non-consanguineous parents with no significant family history of genetic disorders or developmental delays.

Clinical history

The patient was born at 40 weeks’ gestation following an uncomplicated pregnancy and delivery. A heart murmur was detected during early infancy, consistent with cardiovascular abnormalities associated with WS. Parents first noticed developmental concerns at 15 months of age when physical development appeared delayed compared to typical milestones.

At 18 months, the child demonstrated babbling behaviour with vocalizations predominantly directed toward adults. She exhibited characteristic hyper-sociability with adults while showing withdrawal from peer interactions. The child displayed easy distractibility but showed delight in adult attention and approval.

Physical examination

Physical examination revealed the characteristic facial features of WS, including a small upturned nose, small chin, wide mouth, and distinctive facial morphology. Gross motor skills were noted to be clumsy, while fine motor skills showed moderate development.

Developmental assessment

Developmental evaluation revealed significant delays in language comprehension and fine motor skills, while expressive language skills showed relatively normal development. The patient demonstrated poor attention and concentration, with limited sustained focus on activities, as shown in Table 1. During the structured play assessment, the child moved rapidly between toys with minimal engagement in any single activity.

The developmental play assessment indicated functioning at the 11-14-month level, with the ability to perform simple pretend play sequences following adult modelling. This finding suggested that imitation-based interventions could be particularly effective.

Diagnostic criteria

The diagnosis of WS was established based on the ICD-10 criteria (Q93.8), corresponding to the ICD-11 classification under LD90 (Williams–Beuren syndrome). The patient fulfilled multiple diagnostic features, including distinctive facial characteristics, cardiovascular abnormalities in the form of a heart murmur, global developmental delays, a characteristic behavioural profile, and significant speech and language delays.

Genetic counselling

Genetic counselling was provided to the parents to explain the genetic basis of WS, its typically sporadic occurrence, and the low recurrence risk in future pregnancies. The importance of genetic evaluation and counselling during future family planning was discussed to address parental concerns and support informed decision-making.

Intervention strategy

Multimodal therapeutic approach

A comprehensive intervention program was developed targeting the specific strengths and deficits identified in the assessment [Figure 1]. The intervention strategy incorporated multiple therapeutic modalities as outlined in Table 2.

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Figure 1:

Comprehensive multimodal intervention model for Williams syndrome

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Educational modifications

Educational programming emphasized interaction at the child’s level of non-verbal problem-solving abilities. Intervention strategies included presenting information using both verbal and visual modalities, ensuring sustained attention through name-calling and appropriate physical prompts, breaking complex instructions into smaller and more manageable components, and utilizing hands-on learning with adult modelling to reinforce understanding. Classroom seating was also optimized to minimize auditory distractions and support focused engagement during structured activities.

Social skills development

Given the patient’s relative strength in social interaction with adults, the intervention emphasized facilitating and generalizing these skills to peer interactions. This was achieved through adult-facilitated play activities involving other children, structured opportunities that encouraged spontaneous peer engagement, and the use of peer modeling strategies to promote appropriate social behaviours.

Imitation-based learning approaches were also incorporated to support the acquisition of social skills within naturalistic interactional contexts.

In addition, specific emphasis was placed on social boundaries, education, and stranger awareness, given the child’s hyper-sociable tendencies. Structured role-play activities, adult-mediated discussions, and consistent behavioural cues were used to help the child differentiate between familiar and unfamiliar individuals. These strategies aimed to promote age-appropriate social safety and improve regulation of social behaviour.

Outcome and follow-up

The intervention program demonstrated positive outcomes across multiple domains. The patient showed improved attention span during structured activities and enhanced ability to engage in peer interactions with adult facilitation.

Progress was most notable in areas where interventions built upon existing strengths, particularly in social communication and imitation-based learning.

Limitations

This case report represents a single patient's experience and may not be generalizable to all individuals with WS. The relatively short follow-up period limits our ability to assess long-term intervention outcomes. Additionally, the lack of standardized assessment tools at the time of initial evaluation may have impacted the precision of developmental measurements.

Clinical implications

The findings from this case support the implementation of early, individualized intervention strategies in children with WS. Key clinical implications include the importance of capitalizing on relative social-communicative strengths while simultaneously addressing visuospatial and executive functioning deficits, the demonstrated effectiveness of adult-mediated strategies in facilitating peer interactions, and the value of multimodal intervention approaches that integrate both visual and auditory learning channels. Additionally, the case underscores the need for continued cardiovascular monitoring alongside developmental and behavioural interventions to ensure comprehensive clinical management.