My son gonna complete 2 yrs 3 months . But he s not talking yet. He turns when we call his name, listening songs, expressing happiness when he see his dad, understands most of our words. But he s not listening every time as he used to show interest in playing. Also he easily join with elder people and not with his age mates. He used to cry if we scold him. Is he normal ? What I can do for him to encourage to talk ?