Hi, My baby boy is 20 months old, from last one week he is not responding to his name much, previously he used to respond always but now he's responding once in a while. He's active and playing well be understand if I point him to something and ask to bring it. He points to toys and videos in tv. He waved bye and claps. he speaks only few words like Amma, Nanna, Bye, Papa and Baba. Is it normal that he doesn't respond to his name all the time.