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He has made several phonemes that aren’t in the language we speak at home.No I mean absolutely zero contact with or help from modern (say since the last 10,000 years) human civilization.
I mean literally giving birth in a forest and then raising the baby there without ever speaking a word around it or showing it any tools etc.
(this assumes that it will survive to 1-2 years old without any fatal sickness etc. but let's say that the mother/parents will get just enough "outside" help to make sure it does, but the baby itself is not to come in contact with any tech or language)