Infants only learn language skills through genuine social interaction
Infants and small children do not learn language skills by watching television or listening to CDs, but only through genuine, social interaction [1,2].
You cannot, for example, play Spanish language CDs and expect your child to understand or speak Spanish. You must actually speak it to them.
Learning is fundamentally a relational exercise .
Medina, John. Brain Rules for Baby: How to Raise a Smart and Happy Child from Zero to Five. Seattle: Pear Press, 2014.
Kuhl, P. K., F.-M. Tsao, and H.-M. Liu. “Foreign-Language Experience in Infancy: Effects of Short-Term Exposure and Social Interaction on Phonetic Learning.” Proceedings of the National Academy of Sciences 100, no. 15 (July 22, 2003): 9096–9101. https://doi.org/10.1073/pnas.1532872100.