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At what age range are children expected to be able to distinguish languages?

Are there any factors that aid children in learning this skill?

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    Can you specify what you mean by unfamiliar languages? Can early bilingual children be considered in your question? – Alenanno Oct 16 '11 at 0:07
  • +1 @Alenanno: You're correct, that was unclear. I've removed references to "unfamiliar" within the question. Thanks for point that out! -- As for bilingual children as being representative the majority children, no, bilingual children would most likely experience and develop language skills that were not comparable to the majority of children; or at least in my opinion. – blunders Oct 16 '11 at 0:29
  • You imply that the majority of children are not bilingual. Why is that? – Gaston Ümlaut Oct 16 '11 at 2:28
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    @blunders, your question is still unclear as it stands - I think you need to rephrase it as "At what age range are monolingual children expected to be able to distinguish languages other than their native language, i.e. when can they tell if a language is foreign?" (if this is actually what you are going for - i'm not sure). – Floating Tone Oct 16 '11 at 4:21
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    @blunders I'm not sure if a majority of the world's children are bilingual are not, but I don't think anyone knows for sure and it's quite possible that they are (most humans are bilingual). My opinion is that most bilingualism is not the result of schooling, but of growing up in situations where two (or more) languages are in daily use. These bilingual children would be, in many cases, bilingual from their earliest years. – Gaston Ümlaut Oct 16 '11 at 8:16
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I agree with @Nathan that you need to look at studies involving babies to find out at what age children can tell that a language they hear is not their native language.

In particular, there are many interesting studies by Ann Cutler and others, and they have found good evidence that children are attuned to the distinctive intonation and stress patterns of their own language while still in the womb. Right from birth, babies will prefer to listen to those familiar patterns of their mother's language, rather than an unfamiliar language, which indicates that they can perceive the differences.

The interesting thing with these findings, though, is that if the young infants hear a language which has virtually the same intonation/stress patterns as those found in their native language to-be, as Dutch has to English, their behaviour indicates that they perceive it as being the same language. It takes a few months for them to sort out that Dutch is a different language to English, presumably once they start to pick up finer details of the sound systems beyond intonation and stress. Here is a link to Anne Cutler's website including many recent articles.

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Depends on what exactly you mean. Children as young as 9 months can distinguish between native and non-native speech by identifying unfamiliar sounds and phonological patterns. How children acquire a language's phonological system is deserving of a SE question in itself.

I do not know of any studies looking at when a child is able to distinguish between two non-native languages.

Wikipedia's section on phonological development is very comprehensive, detailed, and well cited. If you are able, I highly recommend tracking down some of the studies they cite. While I might not be familiar with any of them by name, every study involving babies I've ever read was extremely fascinating.

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I've had the experience of living with a family with two small children (ages 2 and 3).

The father would only spoke German to them, and the mother would only spoke Portuguese. The kids could clearly understand both of them, even though they didn't speak much. The father told me that the important thing about this is that he would spoke only German to them, and not sometimes German and sometimes Portuguese, for this would get them confused (he wanted them to learn both languages).

I guess the kids could sense that each person had a proper communication system (one for the father and one for the mother). I think this means they distinguished the languages, for understanding what was said to them required that they knew the values of the signs used in the system.

It seems that if one person uses several languages to talk to a child, this would make it harder for the kid to distinguish them.

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    Your "it seems" seems to be a deduction from the father's assumption. But do you have any evidence that it is true. My reading suggests that children in generally are perfectly capable of acquiring several different languages, and learning where and when they can use them. I don't think the father's concern was justified. – Colin Fine Mar 7 '13 at 17:08
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My son grew up multilingual from the get-go. In India, my parents spoke with him in my mother-tongue (Marathi), my in-laws and acquaintances in the national language (Hindi), and I, mainly English. He started forming words and saying baby versions of multi-syllabic words like "calendar" by 8 months. By one year, he could speak sentences like "Happy birthday to you" (baby version, of course) and by 1.5 years, could smoothly change languages based on who he turned to speak with. Replies to questions would be in the language the questions were asked and if he wanted specific information, he would start in one language but change if it was someone replying in another language. I also exposed him to German at 4 and he seemed to take to it easily as well.

I have seen other kids easily picking up 2-3 languages as toddlers - depending upon what the parents spoke at home as well as their nanny or other help. Even if the nanny spoke a completely different language (other than what their parents did), they picked it up. So, I believe children do pick up languages early - earlier than 9 months, if exposed to them early.

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