„Our results demonstrate that – already at the age of 26 months – the children’s productive vocabulary is significantly associated with maternal education. […] Compared to other characteristics of socioeconomic background, maternal education shows the strongest association with child’s vocabulary development.“
Dr. Anja Linberg u. a., Social disparities in the vocabulary of 2-year-old children and the mediating effect of language-stimulating interaction behavior (2020), S. 26.