Weighted quilt/blankets
 

I am hoping to make a weighted quilt for my granddaughter twin size. Any suggestions to help me be successful would be appreciated.

Man Sewing has a pretty good you tube video for one.

Here's the link to Man Sewing (Rob Appell) weighted blanket. He gives some good tips along the tutorial.

https://mansewing.com/2015/04/weighted-blanket/

I am going to make a couple for Christmas. Do you know where the best/most inexpensive place to buy Poly Pellets?

I was going to suggest that one.

I've bought poly pellets at Walmart.com a 10# box is just under $23. I also ordered from TailorSpot on Etsy, those were the heavier pellets.
I've made 3 blankets so far (I made one today for a friend.) but don't piece the fronts I use a solid piece of fabric, usually flannel or minky.
I use a piece of pvc pipe or a cardboard wrapping paper tube stuck down in each channel and a small funnel to pour the beads into the tube. After each row is full I move those beads down as close to the previous row as possible and then put in a row of pins to hold them in place while I take the blanket to the machine to sew that row closed.
These blankets aren't hard to make but they get quite heavy to move around.

What is the purpose of these blankets? How would one wash them?

My daughter (and friend mentioned above) both were/are having sleep issues and the extra weight of the blanket seems to help them relax so they get to sleep faster and stay asleep longer. I have a small lap size blanket that my husband occasionally uses for restless leg syndrome.

I wash them in cold water on a delicate cycle and use just the air or low heat cycle to dry.

Yes, weight from a blanket can help with sleep difficulties. I find a quilt with 80/20 not warm enough with AC, so I added a crocheted afghan, and immediately began sleeping better! Just that bit of weight helped. I hope a weighted blanket will help your granddaughter.

Weighted blankets are comforting to children and adults with sensory disorders, anxiety, and Parkinson’s. They are relatively easy to make—the most important thing is to not try to sew theough a pellet. You can buy pellets bulk on line, at JAF, and most craft stores—whoever has the best sale.

As a child, I always slept under three or four blankets, because the weight just felt good.