Just came across that theory and wow, it's pretty amazing. Her basis indeed has a sense, however, I've read that her idea isn't conclusive as of now. Well, I do hope this would be proven to be true. If yes, it'll be a salvation for future first-time moms like me
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I would say it's really fascinating and it could be possible but it's still inconclusive. There isn't any proof or hard facts to prove that there is a 'baby language'. It's still pretty cool tho. :)