Die „International Early Learning and Child Well-being Study“ belegt auch schon für 5-Jährige hohe Bedeutung der Umgangssprache …

„Having a home language that is different from the ECEC centre or school the child attends is associated with lower learning and development.“
OECD (Hrsg.), International Early Learning and Child Well-being Study, Summary of Findings (2020), S. 7.