The goal of the study is to receive data about emotional states manifestation in the speech and in the non-verbal behaviour features of 4-7 years old children, typically developing (TD) (n=130) and children with autism spectrum disorders (ASD) (n=26). Children with ASD were divided in two groups: presence of development reversals (first group) and developmental risk diagnosed at the infant's birth (second group). Perception and acoustic measures of participant's speech, voice features and facial expression were compared with data from TD children. Unintelligible speech and higher pitch values more prevalent in ASD first group children. Significant differences between TD children and children with ASD were revealed in the voice features, mimic and behavioural reactions.