We are conducting a study to understand brain development in infants that are typically developing compared with young children who have an Autism Spectrum Disorder (ASD) Diagnosis. We will use new non-invasive brain imaging methods developed for infants and young children. We are asking typically developing infants and children between the ages of 2 to 5 years to participate. By conducting brain imaging scans of brain activity in infants, toddlers, and pre-school children we will see how brain processes change across development. We will eventually use this information to better understand brain processes in children with neurodevelopmental disorders such as autism. We will pay you for your time in the study. In addition, your child will receive a small gift.