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I think we've descended out of the fuzzy world of supposition and into the nasty empirical land of testable theories. I'm not going to pretend I have any more insight into this than what I've already typed - but I will say that my pediatrician mentioned that bilingual babies generally have smaller vocabularies in both languages and start talking later, but that these setbacks are offset quickly by other gains. A brief perusal of the web seems to bear out his arguments.