Is it true that a human fetus can in truth protect itself from foul language from the mother surrounded by few and far between cases?

I cannot remember where on earth I hear this from, but awhile ago I be told that within sporadic occasion approaching 1 out of every 8 fetus' (or something approaching that) that are exposed to drugs, and or alcohol while contained by the womb will in fact come out to be smarter than the average child...if you know anything roughly this transport me a relation to a network site and refer me to a book. Thanks.

Answers:
the placenta will filter out greatly of toxins, but greatly will still bring through to the unborn child, cigarrettes raison d`¨ētre low birth counterweight and alcohol cause low intellegence, and in that is like mad of research be done on that, i dont mull over i own ever hear of them coming out smarter
Do you niggardly intentionally? I really doubt it.

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