„Differences in socioeconomic background are already shown in the language skills of 3-year-old children. Children from families with low socioeconomic status showed lower levels of oral language skills than children from more advantaged families. Within the language domain, vocabulary in particular is suggested to be related to family background.“
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. 15.