At what age do infants usually express enjoyment in the sound of their own voice?

Infants typically begin to express enjoyment in the sound of their own voice around 6 months of age. This milestone is part of their vocal development, where they start experimenting with sounds, including cooing and babbling. By 6 months, many infants are not only active vocalizers but also show recognition and pleasure when they hear themselves make different sounds, which is a significant step in their communication skills. This enjoyment is often expressed through laughter, repeating sounds, and responding to their own vocalizations, which play an essential role in the development of language and social interaction as they grow.