This paper investigates the receptive and expressive vocabulary skills of 202 Arabic/Swedish-speaking and Turkish/Swedish-speaking bilingual children aged 4-7 growing up in Sweden, in their home/minority language (Arabic, Turkish) and in Swedish. We explore how vocabulary is affected by age, age of onset, socio-economic status (SES), and minority language exposure in the family (via parents) and via home-language (mother tongue) instruction. The comprehension and production of nouns and verbs was assessed with the Arabic, Turkish and Swedish versions of the Cross-linguistic Lexical Tasks (CLTs, Haman et al. 2015). Background information was collected via a parental questionnaire. In this cross-sectional study, there was a clear and positive effect of age on receptive and expressive vocabulary scores, though the effect was more pronounced for the majority language Swedish, and less so for the home language. Length of exposure had a positive effect on Swedish scores. For minority language vocabulary, language use in the home played an important role: Children whose parents mostly spoke Arabic or Turkish to them had significantly higher vocabulary scores in Arabic/Turkish than other children. For neither language was there any effect of SES (parental education). These results from a Swedish context complement vocabulary studies of other language combinations and reveal the importance of input for the development of receptive and expressive vocabulary in bilingual children.

This paper investigates the receptive and expressive vocabulary skills of 100 Arabic-Swedish-speaking children ages 4;0-7;11 growing up in Sweden. We explore how vocabulary in this under-researched population is affected by age, socio-economic status (SES), age of onset, daily exposure and home language use in the family (parents, siblings, extended family and friends) and via mother tongue instruction. Comprehension and production of nouns and verbs were assessed with the Arabic and Swedish versions of the Cross-linguistic Lexical Tasks (CLTs; Haman et al., 2015). Background information was collected via a parental questionnaire. In our crosssectional study, comprehension was better in the minority home language (Arabic) than in the majority language (Swedish) for the youngest (4-year-old children), but this difference levelled out at ages 5, 6 and 7. There was a clear and positive effect of age on receptive and expressive vocabulary scores in both languages. For neither language was there any effect of SES (parental education). Age of onset and daily exposure had a measurable effect on Swedish vocabulary scores, whilst for Arabic, daily exposure and input in the home played an important role: Children whose parents mostly spoke Arabic to them had significantly higher Arabic vocabulary scores than other children. The complex interplay of environmental and individual-level factors on vocabulary skills is also illustrated by four case studies. These results from a Swedish context complement vocabulary studies of other language combinations and reveal the importance of input for the development of vocabulary in bilingual children.

The Arabic-speaking community in Sweden is large and diverse, yet linguistic reference data are lacking for Arabic-Swedish-speaking children. This study presents reference data from 99 TD children aged 4;0–7;11 on receptive and expressive vocabulary in the minority and the majority language, as well as for three types of non-word repetition (NWR) tasks. Vocabulary scores were investigated in relation to age, language exposure, and socio-economic status (SES). NWR performance was explored in relation to age, type of task, item properties, language exposure, and vocabulary. Eleven children with DLD were compared to the TD group. Age and language exposure were important predictors of vocabulary scores in both languages, but SES did not affect vocabulary scores in any language. Age and vocabulary size had a positive effect on NWR accuracy, whilst increasing item length and presence of clusters had an adverse effect. There was substantial overlap between the TD and DLD children for both vocabulary and NWR performance. Diagnostic accuracy was at best suggestive for NWR; no task or type of item was better at separating the two groups. Reports from parents and teachers on developmental history, language exposure, and functional language skills emerged as important factors for correctly identifying DLD in bilinguals.