According to the social-pragmatic theory, it is the emotional messages of speech, not the that are the focus of early communication.

According to the social-pragmatic theory, it is the emotional messages of speech, not the words that are the focus of early communication.
 This theory states that children do not need specifically linguistic constraints to learn words, but rather what they need are flexible and powerful social-cognitive skills that allow them to understand the communicative intentions of others in a wide variety of interactive situations.