People have trouble with sounds that don't exist in the language (or languages) that they first learned as a young child. We are born capable of both producing and perceiving all of the sounds of all human languages. In infancy, a child begins to learn what sounds are important in his or her language, and to disregard the rest. By the time you're a year old, you've learned to ignore most distinctions among sounds that don't matter in your own language. The older you get, the harder it becomes to learn the sounds that are part of a different language