Yes I still swaddle my 9 month old. Say what you will but it gets her to sleep fast and saves me what little sanity I have left so I'll keep it up as long as I can! If you swaddle (aka burrito wrap) your baby but need something much much lighter for summertime, you'll love this!
I simply bought a yard of jersey knit material and cut it in half along the line that it already had from being on the bolt. You don't have to do anything to the edges because they'll just curl up. If you're picky you can take a rotary cutter to the edges that the fabric store cut so they're straight but honestly it won't matter once you wash and dry it.
This makes two very lightweight, stretchy blankets! You could definately get away with less than a yard if it's for an newborn.
I love me a cheap and easy project!!