We run a foreign language immersion center for children called Kultural Kids,
http://www.kulturalkids.com. We currently have about 125 students and they all are doing great! We encourage parents to enroll their children as soon as they turn one.
The earlier a child is exposed to a second or third language the easier it will be for them to become fluent with a native-quality accent. Any parent thinking about raising a child in a multilingual environment should definitely go for it!
Check out our site! We are looking for educators and parents with experience in this topic to write articles for our resource section. visit
http://www.kulturalkids.com/?q=writeforus if interested!