So let’s imagine an infant called Xi who is born in China and spends the first 6 months of his life there, surrounded, obviously, by speakers of Chinese.
At the age of 6 months, Xi is adopted by a French couple and removed to France where he grows up as a monolingual French speaker with nobody speaking Chinese around him.
But here’s one crucial thing: Xi’s brain will still function as that of a Chinese speaker even though he will not remember a single word of Chinese. In order to speak French – his only language – he will be accessing secondary functions of his brain.
People tend to equate memory with impact and find it hard to understand why the events of infancy and early childhood have such an enormous significance for who they are. It’s precisely before the age of 3, however, that the brain’s extreme plasticity makes it receptive to the environment in a way it will never be again.
This is especially crucial for immigrants to keep in mind. Children of immigrants born in the new country will obviously speak the language of the new country as their native tongue. However, if they are exposed to their parents’ language in infancy, their brain will never be fully set up to process the language of the new country.
What does this mean? That immigrants must expose the child to the language of the new country from birth and, ideally, before birth.

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