Observe the infant during face-to-face interaction with an adult and during daily routines.
While talking to and playing with the infant, vocalizations should naturally occur.
The infant vocalizes to get interaction to continue.
Encourage the adult to interpret the sounds the child makes as having a communicative intent by commenting on what he thinks the child wants. For example, say, “Oh, you want the bottle back?” and hand the bottle back. Or, “You like me to blow on your tummy, don’t you. Here I come again!” These communications let the child know that her vocal efforts are read and responded to, thus encouraging further vocalizations.
 North Carolina Department of Public Instruction, 2015
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