is one of the mental, emotional, and behavior disorders that appears in early childhood. , or autistic disorder, almost always develops within the first 3 years of a child's life. Children and adolescents with cannot interact normally with other people. thus affects many aspects of their development. Children with and adolescents with autism typically: -have a difficult time communicating with others -exhibit very repetitious behaviors (like rocking back and forth, head banging, or touching or twirling objects); -have a limited range of ....