Lilmisssunshine, you might want to look up Patricia Kuhl's research on bilingualism and native fluency.
I'm bilingual in English and French, and was at a near-bilingual fluency in Spanish a few years ago, but am currently out of practice. DH is uningual English.
The plan is to keep DS unilingual until he learns English reading, because that's our household language and both parents' mother tongue, then to phase in French (probably around 3-4) and a dramatically different language of his choice (e.g. Mandarin, Arabic) shortly thereafter while phonemic discrimination is still high. My paternal grandfather was Polish and spoke 7 languages fluently into adulthood, which isn't too far of of the norm of what many South Asian and European children learn. I'd love for DS to be multilingual if interests and abities allow because we have a family history on my side of being strong with languages.
