Children who are noise sensitive may be easily distracted, experience discomfort, and react with negative emotions in the presence of loud or sudden sounds and in environments where they cannot control the noise; this can impact their ability to regulate their emotions. Therefore, implementing effective regulation strategies is necessary to support noise-sensitive children. Assistive technology has been shown to be an effective tool for supporting children and self-regulation. By conducting co-design sessions with noise-sensitive children, we will better understand how we might design an assistive application to support emotion regulation in noise-sensitive children. In this work in progress, we present the initial findings of two pilot co-design sessions and considerations for conducting co-design sessions with children who are noise sensitive.