At first,babies are sensitive to virtually all speech sounds,but around 6 months,they

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Around 6 months of age, babies begin to narrow their focus and limit the distinctions they make to the language they hear and will soon learn. This is known as phonetic narrowing, where they begin to focus more on the sounds of their native language and develop a preference for it. They also start to lose sensitivity to non-native speech sounds. Therefore, choice C is the best answer. Choices A and B may also be true, but they occur at earlier ages (around 2-4 months for musical rhythm perception and around 8-9 months for grammatical structure perception). Choice D is a consequence of phonetic narrowing, rather than a distinct developmental stage.

At First,babies Are Sensitive to Virtually All Speech Sounds,but Around