N.L.
WOW! Russian-that's awesome! I'm not sure what the right answer would be for your child. I agree with Dawn T. Try it and if it's too much, drop Russian until you feel your child is ready. I can tell you from personal experience that I grew up in a bilingual home and I learned both languages at the same time, speaking & reading. English dominated but by elementary school I was reading and speaking both languages at my age level. Now in adulthood I can fluently speak and read both languages and now I say thank you to my parents for educating me like they did. I've done the same thing with my kids and it's working fine but they can only speak the language, not read. My daughter in Kindergarten at age 4 had a friend who spoke English & Japanese and could read AND write both languages. Boy did she impress the pants off me! Children at a young age learn better. They are like sponges. Teaching at a young age is key. I say go for it!