Hand-flapping is a type of self-stimulatory behavior (often called "stimming") that is common among children with autism. It can serve various purposes depending on the individual and the context. Here are some possible reasons why children with autism engage in hand-flapping: 1. Self-Regulation Hand-flapping helps regulate emotions, such as excitement, anxiety, frustration, or joy. It can be a way for children to release excess energy or cope with overwhelming feelings. 2. Sensory Input Some ch