Unfortunately, I can't seem to find any decent sources to back up what I'm about to say, but I'll continue looking. I would like to say that I do remember a conversation I had with a friend studying psychology who said they'd read a study that suggested bilingualism may have a detrimental effect on the literacy level of children, however, I think the study may have been done on exclusively children who speak only spanish in the home and are only taught in english. So, I'm not sure that would really apply to your situation. Furthermore, though this is purely anecdotal, I've found that people who have learned more than one language early in life tend to be able to pick up other languages later in life much easier than monolingual people. Personally, as someone who became basically fluent in spanish after living in spain for awhile and having since lost that fluency, I really regret the lack of people who speak languages other than english in my current place of residence. Language significantly influences the way we think, and I think being able to interpret the world from the different perspectives language gives us is a wonderful asset to have.
We have many intuitions in our life and the point is that many of these intuitions are wrong. The question is, are we going to test those intuitions?
-Dan Ariely
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