Hello doctor My 15 month old doesn’t speaks single word till this age. Not even mamma papa. He started saying papapapa but now he don’t. I keep conversing him every now & then. Read book to him. But neither he points to anything or speaks anything. He babbles a lot like kakaka… kockkock… etc but nothing like meaningful. But I think he recognises words as when I sings certain rhymes (which he generally listens)he looks at my lips with interest. Should I be worried????