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Purpose: The aims of this study were to investigate the occurrence of stuttering behavior across time and to evaluate the relationship between stuttering behavior and language ability in children with Down syndrome. Method: A national age cohort of Norwegian first graders with Down syndrome ( N = 75) participated in the study. Speech samples from a story-retelling task and a picture book dialogue as well as standardized measures of vocabulary, grammar, and nonverbal mental ability were collected at two time points approximately 5 months apart. Stuttering behavior was evaluated through counting stuttering-like disfluencies and stuttering severity ratings. The relationship between stuttering behavior and language ability was investigated through hierarchical regression analysis. Results: The participants had stuttering severity ratings ranging from no stuttering behavior to severe and displayed all types of stuttering-like disfluencies. There were significant relationships between stuttering behavior and language ability at the first time point, whereas the relationships were not significant at the second time point. The stuttering severity ratings were significantly predicted by language ability across time, whereas the frequency of stuttering-like disfluencies was not. Conclusions: The occurrence of stuttering behavior was high across the measures and time points; however, the relationship between stuttering behavior and language ability varied across these variables. Thus, the nature of the relationship does not seem to follow a strict pattern that can be generalized to all children across time.

This study investigated the effect of the digital Down Syndrome LanguagePlus (DSL+) intervention on vocabulary outcomes through a school-delivered randomized controlled trial. A national sample of first graders with Down syndrome from 91 schools was allocated to an intervention group ( n = 50), which received daily intervention for 15 weeks, or a business-as-usual control group ( n = 53). The intervention involved picture book sharing and structured tasks and was organized as one-to-one, small-group, and full-class lessons. Children in the intervention group made greater gains than children in the control group in expressive vocabulary breadth ( d = .429, CI [.160, .699]) and receptive vocabulary breadth ( d = .447, CI [.193, .700]). The outcomes indicate that the novel DSL+ intervention is an effective intervention to increase trained vocabulary among first graders with Down syndrome, and it takes only 15 minutes of effort 5 days a week.

Young children with Down syndrome (DS) often demonstrate impaired oral vocabulary development; however, few intervention studies have focused on this population. One promising method to improve the oral vocabulary of young children with DS may be to train their parents to intervene at home. In this study, we used tele-education methods (e.g., videoconferences, email) to coach parents to implement an adapted version of Down Syndrome LanguagePlus (DSL+). Four children with DS (aged 5–6 years) participated in the multiple probe across behaviors (i.e., stories) single-case research design study. Increasing trends during baseline and data variability precluded confirmation of a functional relation; however, results indicated that all participants increased their scores on mastery measures of targeted vocabulary. Three of the four parents implemented DSL+ with high fidelity and responded favorably to social validity interviews.