I've read that, as well. Do you plan to have your daughter continue to learn Spanish? One of my regrets is quitting German lessons when I was a kid, much to my father's protest. If/when I have a child, I think the things I'll be that parent about are music, sports and learning a second language (my dad, in retrospect, was way too forgiving). Of course, with the proliferation of immersion schools, I think the language thing is comparatively easier now than it was in the 80s.
Don't forget that child-rearing books in the 1980's advised against bilingualism or multilingualism, as language acquisition was not as well understood. What people could see was that bilingual kids took longer to speak and that they'd often respond in the other language, as they hadn't yet figured out when it was appropriate to do so.
We aren't actively teaching her Spanish. We're having her spend her days at a daycare in Venice where the two main workers speak to each other in Spanish and much of the discussion is in Spanish. As such, certain words she knows in English and certain words she knows in Spanish. For example, we've been trying to get her to say "all done" for six months now and her rendition is "rearrgh." Last night, however, she turned down milk by saying "no mas."