The benefits of introducing your baby to another language are well documented. In our rapidly globalizing society, knowing a second (or third) language provides an obvious edge over the competition in the job market.
But, what about its impact on childhood development? While some would suggest that over-exposure to foreign language may cause delay in speaking, this assumption is both unproven and outweighed by the benefits dual-language babies experience as they grow.
We know the many benefits, so the question soon becomes: “When do we start?”
The answer is surprising. According to an article by the Intercultural Development Research Association, it may be most beneficial to begin second language exposure before six months of age. In a study by psychologist Janet Werker, infants as young as four months of age successfully discriminated syllables spoken by adults in two different languages. Dr. Werker’s work also determined a possible decline in foreign language acquisition after 10 months of age. To give your child their best start, you must begin early.
How is this so? The answer can be found in the complex world of the human brain. Our brains react uniquely to language learning at any age, even growing when stimulated by another language. While mankind can acquire a language at mostly any stage, it is exceptionally difficult to do so outside of childhood. From infancy to age five, the brain is capable of rapid language acquisition. Even so, there are varying degrees of acquisition, even for children. After six months of age, infants begin distinguishing the differing sounds of their native tongue and others. Beyond six months, exposing your little one to a brand new language will pose a challenge.
That is not to say that teaching your two year-old French is a bad idea! It is merely to say that the earlier you begin teaching your child, the better.
Though most babies wont utter their first words before eleven months of age, they develop complex mental vocabularies through the piecing together of “sound maps.” As they gather from what they are exposed to, an infant who hasn’t been immersed in another language during this delicate stage will not piece together adequate sound maps to differentiate another language.
The reason for this is rooted in the brain at birth. Children are born with 100 billion brain cells and the branching dendrites that connect them. The locations that these cells connect are called synapses; critical components in the development of the human brain. These synapses are thought to “fire” information from one cell to another in certain patterns that lead to information becoming “hardwired” in the brain. The synapses transmit information from the external senses to the brain via these patterns, thus causing the brain to interpret them, develop, and learn from them. From birth to age three, these complex synapses cause infants to develop 700 neural connections per second.
These synapses are critical in sound mapping, and at the age of six months, the infant brain has already begun to “lock in” these new patterns and has difficulty recognizing brand new ones. This is because although your baby is born with all of the neurons they’ll ever need, that doesn’t mean that they’ll “need” all 100 billion. Infancy to the age of three is filled not only with rapid neural expansion, but also with neural “pruning;” a process in which unnecessary connections are nixed and others are strengthened.
Exactly which connections are pruned and which are cultivated is partially influenced by a child’s environment. Synapses are cultivated or pruned in order of importance to ensure the easiest, most successful outcome possible for a functioning human being. If a function is not fostered during this stage, it is likely that the neural connections associated with it will fade. For the brain to see a skill as important, you must make it important.
To put it plainly, if you only speak to your child in English, the infant brain sees no reason to retain a neural pathway regarding the little Mandarin it has heard. Babies learn about their environment at every age and are internally motivated from birth to do so. Your baby wants to learn and does so by exploring and mimicking the world around them. They’re entirely capable of building a complex knowledge of Mandarin, Arabic, or Italian. So, why not feed their mind and start now?
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