„Children growing up in families with a low SES (Anm.: socioeconomic status) have smaller vocabularies and more restricted language skills compared to their peers from higher SES families. Already at the age of 18 months, Fernald and colleagues documented differences in productive vocabulary and language processing related to social background. At 2 years of age children from families differing in SES already showed a 6-month gap in language processing skills important to language 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. 15.