According to http://www.telegraph.co.uk:
Babies who hear foreign speech in their first nine months of life find it easier to pick up languages in school or as adults, research has found.
To quote the article published on May 10th, this year:
Psychologists at Bristol University found that the developing brain undergoes a period of “programming” in infancy which sets up for life its ability to recognise key sounds in whatever will become its native language.
This process helps the brain make sense of speech by filtering out sounds not used in the native language, but also makes it harder to recognise unfamiliar sounds from foreign languages.
Crucially, babies exposed to multiple languages during their first few months retain the ability to recognise sounds from all the languages they hear.
English speakers, for example, usually only recognise one “k” sound, but Irish Gaelic, Russian and Turkish speakers can differentiate between hard and soft “k” sounds, which produce different meanings in those languages.
In short, introducing a very young child to the sounds of foreign languages will give them the ability to recognize them. Since children of this age absorb huge amounts of information from everything they learn, these sounds will be stored in memory and they will be able to recall and recognize and even use them later in life.Read the rest of the article here:http://www.telegraph.co.uk/news/uknews/1944528/Babies-who-hear-foreign-speech-pick-up-languages-faster.html