Welcome to Heuropa!
Heuropa! is a future online platform for interactive learning of polish, czech and lithuanian language (release in 2014). The focus of heuropa! is on bilingual kids & teens and their families.
A recent study from Mike Vitevitch could proof, why bilingual speakers can easily switch from one language to another without struggling to find the right word. According to Vitevitch they do not have to “add a label to each word to identify it as being from one language or the other”, they just choose the language first and then look for the right word. There is apparently no need for extra-marking.
His conclusion: parents don’t have to be afraid that speaking and processing two languages in everyday life would harm the cognitive performance of their children.
(References: Vitevitch, M.S.: What do foreign neighbors say about the mental lexicon? Bilingualism: Language and Cognition, 2011)