I have recently read an interesting article about bilingual while surfing the internet. An acquaintance of mine said it is not good idea that children are taught two languages from their early ages. It turns them into weak in terms of memory. Furthermore, It is likely to lead them to mentally defective. But the result of the study, which is made by a group of the researchers led by Ellen Bialystok, is on the other way around. Lets read about what the researchers teased out.
Generally, in terms of being able to speak foreign language, people are divided into two groups Bilingual and Monolingual. The bilingual means an ability to speak more than one language, whereas Monolingual is an competence to speak only one language... (the writer is so tired, if you want to read more, go to the link below)
Source : http://www.nytimes.com/2011/05/31/science/31conversation.html?_r=1&