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In countries with universal access to early childhood education and care (ECEC), child participation is high across a range of socioeconomic groups. However, ECEC quality is often varying, and many children spend much time in ECEC settings that are not necessarily high quality. In this observational study, we therefore examined the relationship between observed ECEC quality and children's cognitive development at age three years in Norway-a country that provides universal access to ECEC from age one. The sample comprised 800 children, enrolled in 83 ECEC centers, who were assessed in verbal and non-verbal cognitive ability. ECEC quality was measured with the Infant/Toddler Environment Rating Scale (ITERS-R), and cognitive outcomes were measured with the Naming Vocabulary and Picture Similarities subtests of the British Ability Scales III (BAS III). The results showed that children's cognitive development at age three was not associated with ECEC quality; irrespective of socioeconomic background.

Developing proficiency in the language(s) spoken in any given society is crucial for the inclusion and attainment of children in that society. With an enrolment rate in Norwegian early childhood education and care (ECEC) of 93.4% for children between age one and five, ECEC constitutes an important out-of-home learning environment for children in Norway. In this study, we examine how the quality of language-learning environments in toddler and preschool groups predicts children’s expressive vocabulary in the majority language depending on children’s home languages. Data from the quality rating scales ITERS R and ECERS-R were used to model quality factors related to expressive vocabulary in toddler and preschool groups. The sample included 1,078 children (876 children with parents who spoke the majority language exclusively, 104 children with one parent who spoke the majority language and one parent who spoke another language, and 57 children with no majority language speaking parents). The results show that the quality of the language-learning environment in toddler and preschool groups is positively associated with expressive vocabulary in the majority language at age three and five, but only for children whose parents spoke the majority language exclusively.

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