Language undestanding and speaking.

My child has difficulty in understanding language on his own and communicating with others.Although he is a very active and happy child,he memorizes things easily but he is having difficulty in learning language by listening to others and i felt that due to this most of the time he lacks concentration due to which he is unable to learn language on his own.He has some unusual interest in seeing things like fan,A/C,mixer grinders etc.He get afraid of very silly things if he sees them for the first time like showers, room heaters, technician visiting our home, visiting new places, seeing anything unusual which he has not seen before.As the time passes with gradual and consistent effort he overcome the fear and star feeling comfortable.He generally don't want to come out from his comfort zone.Due to all these reasons it is very frustrating sometimes to make him understand certain things like and he also become very adamant at times.