Purpose: The aim was to evaluate the effect of a motor-based, hierarchically structured intervention directed at active nasal fricatives substituting /s/ in young children with normal palatal function.

Method: An experimental single-subject design was replicated across three children, aged 4–6 years, with normal palatal function, who substituted oral /s/ with active nasal fricatives. Treatment was performed weekly by a speech-language pathologist and included home training conducted by parents. Audio documented probes were registered regularly and /s/-production evaluated as oral or nasal.

Result: All children achieved 98–100% oral production of /s/ in six probed linguistic contexts at treatment end and exhibited good maintenance at follow-up. The four-year-olds showed gradual or inconsistent response and slower progress, the six-year-old direct response and faster progress.

Conclusion: The study provides preliminary evidence suggesting positive intervention effects for treating active nasal fricatives in children with normal palatal function. However, possible confounding effects such as maturation or repeated testing could not be ruled out; thus, results need to be replicated with increased experimental control. Nevertheless, the study adds to the currently meagre empirical evidence-base for the population. Individual treatment response and progress patterns were found and data suggests that the intervention may be beneficial from age 4.

Parental responsive behaviour in communication has a positive effect on child speech and language development. Absence of canonical babbling (CB) in 10–month–old infants is considered a risk factor for developmental difficulties, yet little is known about parental responsiveness in this group of children. The purpose of the current study was to examine proportion and type of parental responsive utterances after CB and vocalization utterances respectively in a clinical group of children with otitis media with effusion, with or without cleft palate. Audio-video recordings of interactions in free play situations with 22 parents and their 10-month-old infants were used, where 15 infants had reached the CB stage and 7 infants had not. Fifty consecutive child utterances were annotated and categorized as vocalization utterance or CB utterance. The parent’s following contingent response was annotated and labelled as acknowledgements, follow-in comments, imitations/expansions or directives. The Average intra-judge agreement was 90%, and the average inter-judger agreement was 84%. There was no significant difference in proportion contingent responses after vocalizations and CB, neither when considering all child utterances nor the child’s babbling stage. However, imitations/expansions tended to be more common after CB in the typical babbling group, whereas acknowledgements were more common after CB in the late babbling group. Our findings imply that responsiveness is a supportive strategy that is not fully used by parents of children with late babbling. Implications for further research as well as parent-directed intervention for children in clinical groups with late babbling are suggested.