- Why did everyone start to hate the Russians if the U.S. did the same thing in Afghanistan, Iraq?
- What needs to be corrected in the management of Russia first?
- Why did Blaise Pascal become a religious man at the end of his life?
- How do I know if a guy likes you?
- When they say "one generation", how many do they mean?
Theoretically, this is possible.
Practical – requires a lot of money and a competent approach.
The issue of bilingualism is considered in the works of many scientists (E. M. Vereshchagin, L. V. Shcherba; foreign researchers). One of the main conditions is the environment in which the child grows up. Language does not exist outside of culture, therefore, teaching a child a foreign language should take place in a linguocultural context. Especially when it comes to bilingualism.
By the way, there is an interesting theory according to which the ability of a person to absolutely accurate onomatopoeia is completely lost by 6-7 years (if your goal is a bilingual with an ideal language. BUT: in this case, we are talking about contact only with a native speaker).
In general, you can talk for a very long time on this most interesting topic.
But I don't recommend experimenting with the child's psyche. If you decide to do this with your child, please read the theory of bilingualism.
The brain of a child is “most capacious” at the age of three years.
There is a good book by Masaru I. “It's late after three.” There are no specific methods given, but rather in simple words it tells about the formation of a child's mental activity from birth to three years.
I can also add that motivation plays an important role for a successful foundation in training and upbringing. You can say that the child is interested in the whole world. And his motivation is the whole world around him (discoveries).
The main thing is to immerse the child in an environment that is accessible for their interaction (audio, video, just parents who speak several languages, for example).
Only on Wednesday. If one of the parents or other close relatives constantly speaks a certain language, then the child will somehow begin to learn it. A story from the Internet immediately popped up, in which a daughter was born in the marriage of a Portuguese and a Dutch woman who moved to Spain and speak English to each other. And in the end, she knows all 4 languages. (I don't remember the exact moments of the story, maybe I got it all wrong here, but it doesn't change the essence.)
It is not necessary from early childhood to enroll him in all sorts of unnecessary courses and overload the child. This makes sense only when the child is already at school in a year, and then how it will manifest itself. Maybe he will like it so much that he will want to learn other languages himself.