I made this weighted blanket for an 8 year old to help him sleep at night. It was made with steel BB's and had to be 10% of his weight. It was a workout but was totally doable. I sewed the front and back right sides together on 3 sides turned it right side out and turned the 4th side under and basted it down. I proceeded to sew vertical lines every 4 inches. The math of how many bb's in each square depend on how much it needs to weigh and how many squares you end up with....I had 187 squares to fill with bb's and a little bit of batting or polyfil. My hubby cut me the perfect sized pvc pipe to stuff the stuffing in, then you sew horizontally after each row is filled, and so on. I really hope this little guy is completely Blessed with sweet dreams and rested days in his future endeavors.