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I am sure many of these children got expose to language outside of the home; Youtube.

I don’t have a source now, but a while ago (pre-pandemic) I saw a study that showed babies don’t pick up basic language structures very well at all from videos for whatever reason.

Presumably from lack of relevant context (i.e. relevance to the child's own needs/sensory experience) and lack of trial and error.

Similarly you can't learn to write code very well from watching videos of someone watching code, especially when they're not trying to teach code through the video.

My daughter used to speak a mix of es-as, es-es and es-mx (and perhaps a some more) from YouTube. Now she is going back to normal and speaking mostly in es-ar.

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