Discussion of DSM-V diagnostic criteria and the difference with DSM-IV conditions Important developmental features & assessment of developmental milestones A brief list of important Differential Diagnoses of Autism Spectrum Disorder Genetic disorders & Inborn Errors of Metabolism that can be the underlying etiology and their diagnostic assessment Detailed discussion and numerous examples on Early features of Autism, Symptoms among preschool children versus school-aged children Workup and Management of Autism Spectrum Disorder (For USMLE Steps 1, 2, 3)