„Especially the first three years of a child’s life are found to be important: In this time children are highly dependent on their family. Experiences, knowledge, nurture, and socialization of children are based on the family they grow up with. […] Various studies have shown the association of social background with language development starting at the age of 18 months onwards.“
Dr. Claudia Karwath u. a., Does Poverty Affect Early Language in 2-year-old Children in Germany?. In: Journal of Child and Family Studies (2022), S. 2.