Speaks in his own language

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Updated on Mar 31, 2017
My son is 1 year 7 month old. He speaks some word like Aai, baba , Kaka, mamma, house as hou, fish as Fi, car, cow, bye it speaks clearly.... But he speaks alot in his own language which we are unable to understand. He responds to request from us. We talk to him all the time. When will he start to speak clearly. Can anyone please suggest, if I can make any extra effort for this?