Augmentative and alternative communication (AAC) is defined as a wide range of different strategies and processes that complement and/or replace speech and its understanding in people with complex communication needs. Such intervention is intended for persons with complex communication needs, caused by different causes, across all age groups. AAC users also include children diagnosed with autism spectrum disorders. The aim of this paper is to provide an overview of recent studies on the application of augmentative and alternative communication systems at an early age in children with autism and to determine how much they comply with the guidelines on the implementation of AAC systems. The review of available literature confirmed the effectiveness of the use of different AAC systems at an early age in children diagnosed with ASD. It included case-by-case studies, group studies as well as comparative studies aiming to compare the effectiveness of different AAC systems in this population. A positive effect was found on the development of speech and various communication functions, improvement of social interaction skills and relationships with the environment, reduction of the rate of undesirable behaviour. Research shows the importance of interventions aimed at the entire family and other active participants in the child's environment (peers, teachers) and their active role in implementing augmentative and alternative communication and achieving positive effects. The results presented can reduce social stigma and prejudice related to the implementation of these systems and improve the quality of life of autistic children.