I find it amazing that if a child is brought up in a community/country different from the origin of the child, the child is still able to pick up and speak their language fluently. Our ability, as humans, to imitate and communicate is incredibly complex regardless of where we are from.
So my question is, is there a language that cannot be spoken like this? One which only people with a certain genetic advantage can speak fluently during upbringing.
Of course anyone can learn a language by putting effort into it. My question is only for one learnt during upbringing (native language).
(Not sure why my responses are downvoted. I’m a non-native English speaker. Sorry if I didn’t communicate something properly. It’s just a scientific curiosity.)
No. Kids work out language from exposure. Baby babbling is them working out how to make the sounds they hear. Sounds which don’t exist in a first language are hard for adults to learn but any child brought up hearing those sounds will be able to make them and, if they were exposed for long enough in early childhood, they will know how they go together to produce meaningful speech.
Young children brought up with two or more languages will take a little longer to reach various speech milestones than their monolingual peers because they have a much more complicated puzzle to solve. But they’ll end up sounding like a native speaker in both languages.