Young children with developmental delays, neurodevelopmental disorders, or other developmentally atypical presentations are increasingly referred to the mental health system of care because of symptoms that include prolonged tantrums, aggression, anxiety, and sensory processing difficulties. Concerning behaviors can be viewed as constitutional components of a neurodevelopmental disorder as well as symptoms of a mental health diagnosis. This article presents highlights from the treatment of a child dually diagnosed with autism and anxiety. Child--Parent Psychotherapy (CPP) and a traumatic-stress framework were used to treat anxiety stemming from neurosensitivities, in combination with the integration of services for neurodevelopmental differences from other systems of care.