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Before the end of the first month, the child can recognize their mother's voice.
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In response to someone talking to them, the child will produce 'cooing' noises such as "ah-ah-ah" or "ooh-ooh-ooh".
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The child starts vocalising to get attention of someone.
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By eight months, the child will start forming sounds like 'ah goo'.
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Babbling begins and increases; by year's end, infant masters sounds of own language and usually saud his or her first word.