Sensory Processing Disorder is common among the FOXG1 community. Many times, the repetitive behavior you see your child doing is a self-soothing or sensory input need. Many exhibit a “handwashing” motion, where they constantly rub their hands, or mouth their fingers. They may bite because they have no oral stimulation, and when they teethe it’s an instinct to want to chew on something to help teeth break through. Through trial and error, you can sometimes find alternative, non-harmful ways for them to “stim” (stimulate) whatever it is they need the input for. Check out Chewlery for example.