„Children whose mothers have a low or no education show far below-average increases in their language skills. At the age of five, these children are, on average, one year behind children from families in which mothers have a tertiary degree and this gap doubles in the four years that follow. […] The finding that SES gaps (Anm.: SES = socioeconomic status) in vocabulary skills increase might be surprising, as all children attend preschool and later on elementary school, where they share the same curriculum.“
Univ.-Prof. Dr. Thorsten Schneider u. a., Development of socio-economic gaps in children’s language skills in Germany. In: Longitudinal and Life Course Studies, vol 13, no 1, 2022, S. 108f.