It's still about words that are part of a language, not about sounds made by one baby. The universality was about the sounds becoming part of the language. The

It's still about words that are part of a language, not about sounds made by one baby. The universality was about the sounds becoming part of the language. The process of creating a new word in language is not the same as the process of interpreting sounds as belonging to a certain word in a language. So you still have that bridge to gap between "higher frequency of ma" and how the word "mama" was created. Perhaps it's convincing, I'm not sure.