There are a number of indicators that a child may need intervention. The following is a partial list.
Does your child:
Have dIfficulty following directions?
Have difficulty being understood by others?
Have difficulty imitating sounds?
Struggle to express wants and needs?
Have a hard time carrying on conversation?
Struggle to get his/her thoughts down on paper?
Refuse to try new foods or have a significantly limited list of foods that he/she will eat?
Still drool after age 2?
Sound hoarse or lose his/her voice frequently?
Show frustration when trying to get words out?