@Devi Thank you for the reply. Yes he does go to the preschool. In spite of he going to the preschool, he is not comfortable to get along with new people he would come across.
@Anonymous How long is he going to preschool? If the child is using too much of screen time try to reduce it and bring him in co tact with new people often, like a stroll in a park, playing in neighborhood and first let him get comfortable with his classmates. Choose 2 kids and arrange once or twice a week play dates with them. Let him become comfortable with few. Pls then observe how is he moving.