„Joint picture book reading at the age of seven months is associated with vocabulary size in 2-year-old children. […] Additionally and in line with the results for vocabulary, joint picture book reading at the age of seven months is found to have a significant positive effect on early grammar skills.“
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. 8f.