Abstract: This retrospective study provides insights on linguistic development in exceptional circumstances assessing 378 children (between 2;6 and 3;6) who lived their first years during the COVID-19 pandemic and comparing it with normative data collected before this period (CDI-III-PT; Cadime et al., 2021). It investigates the extent to which linguistic development was modulated by a complex set of factors, including sex, maternal education, book reading, language-promoting practices, COVID-19 infection, parental stress and sleeping problems, considering three periods (during lockdowns, out of lockdowns and at present). The results show a substantial negative effect of the pandemic on both lexical and syntactic development. Considering individual variation, structural equation modelling unveiled a complex scenario in which age, sex, book reading, language-promoting practices, sleeping problems and COVID-19 infection showed a direct effect on linguistic development. Maternal education and parental stress had an indirect effect on children's language, mediated by book reading and sleeping problems, respectively. ; This work was financially supported by Portuguese national funds through the FCT (Foundation for Science and Technology) within the framework of the CIEC (Research Centre on Child Studies of the University of Minho) projects under the references UIDB/00317/2020 and UIDP/00317/2020. ; This research was financed by Fundação La Caixa (project reference LCF/PR/FP22/62010012). It was also supported by the Centro de Investigação em Psicologia da Universidade do Minho (UIDB/PSI/01662/2020 and CEECIND/00408/2018), the Centro de Investigação em Estudos da Criança da Universidade do Minho (UIDB/CED/00317/2020 and CEECINST/00018/2021) and the Centro de Linguística da Universidade de Lisboa (UIDB/00214/2020), through the Portuguese Foundation for Science and Technology and the Portuguese State Budget, and supported by the Spanish Ministry of Universities (RD 289/2021), funded by the European Union – NextGenerationEU (Grant ...
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