Check out any recommended weighted blanket size chart, and they will report the same thing. If a young child is sleeping in a full-size bed, the common adult 50-inch X 72-inch weighted blanket will be too heavy for the childâs weight. The child size weighted blanket needs to concentrate exclusively on the weight of the child and not the bed size. BUZIO Kids Weighted Blanket 3lbs, Unicorn Fleece Blanket for Kids with 4 Color Options, Ultra Soft and Cozy Kids Blanket, Great for Calming and Sleep 36x 48inch,Light Blue 4.8 out of 5 stars 1,195. â¦ Determining how heavy a weighted blanket â¦ For kids that weigh 50 lbs - 110 lbs , choose a 7 lbs 41" x 60" Weighted Blanket: Most young children require a weighted blanket â¦ ... Sizing Chart Weighted blankets are much smaller than normal blankets and will not cover the entire bed or hang off the edge of the bed. The general rule of thumb for choosing a weighted blanket is based on your total body weight. 10 â Use a weighted blanket for short periods at first. Weighted Blanket for Kids. Autistic kids for example, often take to and love weighted blanketsâ¦ Kid 36 â¦ Benefits Details & Care. If your child is sleeping on a single twin size mattress (38 inch by 75 inch) then the best kids size weighted blanket is our 41â x 60â blanket. If you or your child are new to weighted blankets, itâs a good idea to use the blanket for short periods of time initially, to see how you get on.