Infants learn language in interaction. Comprehension gets established first, and this guides both interaction and later word production. They look at faces and hands, follow adult gaze, attend to voices and actions, react to these and start playing exchange games from 2 to 3 months on. They rely first on gestures and later add words to communicate. Both gesture and gaze accompany language use through adulthood. Face-to-face communication is multimodal from the start and remains so throughout adulthood.
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