My son with delayed speech also had sensory issues. He had trouble sitting in a chair. My sister recommended a giant exercise ball for him to sit on. It helped and he used it for about a year before transitioning to a chair. He also had a biting tic. This was challenging. To keep him from biting his brother, I got him some "chew" toys. Unfortunately they didn't last long. Because he was learning to write, many times he would chew off the pencil eraser and swallow it. I was horrified. I had to watch him constantly. I worked on transferring his need to chew to using a fiddle ball with his hands. He was disciplined if he bit someone. Over time it worked, however in the transition he began severely pinching his brother instead of biting. As an adult, he still needs to fiddle with his hands as a neural impulse outlet. What also helped was discovered by accident. This son was born with an overbite and the orthodontist wanted him fitted with headgear to extend the lower jaw. It works if done early while the child is growing. I was surprised at how well he responded to this treatment. I think the light pressure on his jaw from his headgear served the same function as Kim's body pressure roller for her girls. He had to wear the headgear for about a year and a half and it helped to radically suppress his biting impulse. Aligned teeth and no biting! A twofer.