My boy is 2 yrs old but he still not talking , not even papa or mama. He only speak his own langauge, doctor said his ear n nose hv no problem. How late will a baby start to speak?

Talk to him more, conversation style. Not ask him copy u. But make sure he understand what u talk. Or else, he will only learn parrot style. If u are worried, bring him to KK for a check 1st. As my sister is waiting for him to talk, eventually drag it even longer.