Rushank not respond whenever anyone ask something, like where is your father or mother, or what is your name etc etc.but he always talk about various rhymes and abcd and 1,2,3,4 upto 20.he not even know who is his father or mother.but whenever we try to teach with some reading books , like a for apple etc, read properly,know even multiple colours also all alphabets..but ignored whenever anyone ask something, not respond.He is now 2year 8months old..what should we do?