By six to twelve months of age an infant is a specialist in his own native language. Explain.

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By six to twelve months of age, infants become specialists in their own native language due to the process of language acquisition. Here's an explanation of how this happens:

1. Early exposure to language: Infants are exposed to language from the moment they are born, and they start processing and making sense of the sounds they hear. They begin to recognize familiar voices and distinguish between different speech sounds.

2. Language discrimination: Infants have a remarkable ability to discriminate between different speech sounds. They can detect the phonetic distinctions that are relevant in their own language, even if those distinctions do not exist in other languages.

3. Babbling and vocalization: Around six to eight months of age, infants start babbling, producing a variety of consonant and vowel sounds. This babbling is an important step in the development of language as it helps them practice the motor skills needed for speech production.

4. Word comprehension: By the age of around nine months, infants start to comprehend words. They can associate certain sounds with specific objects or actions. They respond to their own names, familiar words, and understand simple instructions.

5. First words: Between ten and twelve months of age, infants begin to produce their first recognizable words. These typically include simple nouns like "mama" or "dada" that refer to familiar people or objects in their environment.

6. Language expansion: As infants continue to be exposed to language, their vocabulary and understanding of sentences grow rapidly. They start to understand and use more complex words and phrases, and their receptive and expressive language skills develop further.

It is important to note that this language acquisition process varies slightly from child to child, and cultural and environmental factors can also influence the rate at which infants become specialists in their native language.