This paper focuses on the aspects of the lexicon in 66 prematurely born very-low-birth-weight and 87 full-term Finnish children at 2;0, studied using the Finnish version of the MacArthur Communicative Developmental Inventory. The groups did not differ in vocabulary size. Furthermore, the female advantage in vocabulary size was not seen in preterm children. The overall shapes of the trajectories for the main lexical categories as a function of vocabulary size were highly similar in both groups and followed those described in the literature. However, there were significant differences in the percentage of nouns and grammatical function words between the two groups. The results suggest that prematurity ‘cuts off’ the female advantage in vocabulary development. Furthermore, it also seems that there are differences between prematurely born and full-term children in the composition of the lexicon at 2;0. The findings support the universal sequence in the development of lexical categories.

Background and aims The most severe problems in language manifest as difficulties in comprehending oral language. These difficulties are persistent and expose individuals to several risk factors. There is a lack of intervention research in the area of oral language comprehension, and no reviews have focused solely on oral language comprehension interventions in young children. The aim of this review was to identify interventions targeting oral language comprehension in children 8 years or younger with language disorders or difficulties. The review also examined the possible intervention foci, efficacy, and level of evidence of these interventions. Methods A systematic scoping review of eight databases was carried out. Twenty of 2399 articles met the inclusion criteria and a further six articles were identified through reference lists of sourced articles. These 26 articles described 25 studies. Altogether 2460 children aged 1–8 years participated in the 25 studies. The data from these studies were extracted and analysed, and the intervention foci, efficacy, and level of evidence were evaluated. Main contribution: The reviewed interventions focused on three aspects: modifying the communicative environment of the child; targeting aspects of the child’s language; or targeting the child’s language processing. Of the included studies, 80% indicated positive effects on participants’ oral language comprehension. The level of evidence of the included studies varied. With few exceptions, researchers and practitioners can have moderate confidence in the results of the included studies indicating that it is possible to ameliorate difficulties in oral language comprehension. Conclusions This review summarises the existing evidence on oral language comprehension interventions in young children with language disorders or difficulties. The evidence base is still limited, and more research is urgently needed. The results suggest that though not all interventions seem to provide desired outcomes, there are several interventions indicating efficacy to target problems in oral language comprehension in 1–8-year-old children with language disorders or difficulties. A careful choice of therapy technique and collaboration with people in the child’s environment is required to maximize outcomes. Implications: The results suggest that young children’s oral language comprehension skills can be improved by guiding parents and clinicians in their communication strategies, and by clinician-implemented interventions targeting aspects of the child’s language. The research on interventions targeting children’s language processing is limited, and the results mixed. The present study provides information on different oral language comprehension interventions and their outcomes. The findings are readily applicable for clinical use.

Specific language impairment (SLI) is a condition that affects children’s emerging language skills. Many different language skills can be affected in SLI, but not all individuals with SLI have the same set of difficulties. As a result, SLI is a highly heterogeneous condition. The ability to read and understand written text is a higher function of language, which has its base on the language skills that may be affected by SLI. Previous studies suggest that children with SLI are at risk of developing literacy difficulties at school age. To test this hypothesis a longitudinal follow-up study of SLI was performed in an urban city in Finland. Forty-three children diagnosed with SLI completed tests for lexical and rapid automatized naming (RAN) and reading ability (technical reading and reading comprehension). Children were tested in schools in years one to three, at the end of each school year. At the age of 10 (year 3) children with SLI had relatively weak technical reading abilities with somewhat stronger reading comprehension abilities and concomitant lexical retrieval impairments, but age-appropriate RAN abilities. These findings lend further support to the view that SLI imposes a considerable risk in learning to read. Even in an orthographically highly transparent language, such as Finnish, technical reading skills often seem to remain poor. In this study, the findings on the development of lexical retrieval abilities support the Matthew-effect model in reading development (Stanovich, 1986), while the results of the development of RAN abilities support the developmental lag theory (Stanovich et al., 1988). All in all, these children with SLI had great difficulties in learning to read, which places them at a serious risk of developing concomitant learning problems.

The low prevalence of SLI in this study might be a consequence of the path of intervention that effectively separates SLI from delayed language development. Furthermore, the questions of language specific features needs to be emphasized. The findings of this study suggest that the prevalence of SLI increased as did the prevalence of DLD. The range of prevalence estimates of SLI in different studies raises the need for national and international epidemiological studies of SLI with equal criteria of assessment in each language.

The findings of this study suggest that it is important to give staff members the opportunity to learn new practices and to explore the thinking that underpins the actions they perform during communication training.