„Many studies show positive effects of the attendance at early educational institutions on children’s language skills. […] Yet, results are controversial with respect to the effects of very early attendance at centre-based care. In particular, previous research underlines the importance of the time of entrance in centre-based care and the intensity/amount of time spent there, showing that children who start to attend centre-based care from a very early age and/or spend a large amount of hours in care from early on appear to be at an increased risk for behavioural problems.“
Dr. Anna Volodina u. a., Explaining gaps by parental education in children’s early language and social outcomes at age 3–4 years: evidence from harmonised data from three countries (2022), S. 4.