During the first 12 months of life, infants achieve a series of milestones in postural (e.g., independent sitting) and vocal (e.g., babbling) development. Difficulties with postural control and delayed language and communication development are common among young children with ASD. Therefore, identifying disruptions in postural and vocal development in infancy may help predict later ASD diagnosis. This research has the potential to help detect indicators of risk for ASD at a significantly earlier point in development than is currently possible, which will allow for early initiation of treatment services. It is also focused on milestones that both parents and physicians can easily be trained to identify thus making it highly useful in populations less trained to recognize more subtle early warning signs of autism.