Talk to them about “sitting calmly”: sitting in the chair, fidgeting as needed, and being able to focus. If they can’t “sit calmly”, then they need a way to get more sensory input. Teach them to recognize this, and ask for a break to stim or move around. Learning to ask for a break is an important skill for autistic children. [1] X Research source

Sit on the wedge to demonstrate that it is comfortable and safe. Seat wedges may come with tactile bumps. Explain how they can run their fingers along the bumps.

Experiment with different stim toys and find out what the child likes best. Get a bin of different stim toys. Before the child goes to sit down, ask them to run to the bin and pick out a stim toy to use at their chair.