Belly breathing with biofeedback app for Anxiety

Belly breathing is a popular relaxation technique used to reduce anxiety and pain in children during medical procedures. The investigators have developed a biofeedback game that will help teach children how to belly breathe in an interactive way. Existing studies have shown that biofeedback tools are effective ways to teach relaxation techniques to children. The purpose of this study is to evaluate 1) whether this new biofeedback tool is a more a effective and engaging way to teach belly breathing to children and 2) whether the application is more effective in reducing procedural pain and anxiety compared to standard of care, self-directed belly breathing alone or self-directed belly-breathing combined with visual distraction. The investigators hypothesize that: The smartphone-based biofeedback game for belly breathing will reduce self-reported procedural anxiety and pain in children during a blood collection procedure compared to: standard of care belly breathing + standard care procedures belly breathing with visual components of the application with no coaching or biofeedback distraction. The smartphone-based biofeedback game will increase compliance with belly breathing compared to self-directed breathing. Belly breathing with smartphone-based biofeedback game will be more engaging compared to self-directed belly breathing.