My son is almost three but speak few words only. He is not that fluent in words also and taking too long to communicate.Sometimes I keep calling his name and he doesn’t respond to me. He lacks alertness. He only likes to play and interact with his age group but he is not going to school also. He is taking so much time to speak fluent words . I keep talking to him and keep trying all day. It makes me sick sometimes. Please help doctor.