At what age is an infant able to distinguish male from female voices, discriminate between ethnic groups, and match grandma's voice to her face?

Name: At what age is an infant able to distinguish male from female voices, discriminate between ethnic groups, and match grandma's voice to her face?
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Research suggests that infants as young as 3 months old can distinguish between male and female voices and discriminate between different ethnic groups. They may also be able to match familiar voices to faces.

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