google sit n sew fidget quits, lots of information will pop up. I have made these for children, most the parents like the placemat size. Easy to take along to appointments, car trips, etc. On one site it advised to sew over each seam of each item you attach several times so they can not be torn apart and become a hazard. I'm not sure about making a weighted quilt. I did some research on them, they should be made so the weight of them is one tenth of the child's body weight. A 100 pound child would need a 10 pound blanket. That can be quite heavy to carry around. I think they are used for sleeping, the little pellets in the blanket conform to the child's shape kind of like a big hug. I guess thats what comforts them. On the other hand some autism children don't like to be touched.