The GEMMA project team consists of an EU consortium of researchers that are funded by the European Commission as part of Horizon 2020 Program. This study team aims to develop a greater understanding of autism-related symptoms and its comorbidity to gastrointestinal dysfunction. The study is currently enrolling infants that are 0-6 months of age who already have a sibling diagnosed with Autism Spectrum Disorder (ASD). This project will provide comprehensive autism assessments for these infants starting at 12 months of age up until age 3.