Nothing beats a good swaddle, at least if you are an infant. Most store-bought receiving blankets are too small or too thick to wrap a baby well, though. The most useful swaddling blankets are flannel ones you make yourself.

Turn a 1/4-inch hem along a large square of flannel. Stick the crochet hook through the material under the hem, and make a single crochet over the hem. Make another single crochet to lie on the top edge of the hem. This is what my grandma calls a blanket stitch.

Make another blanket stitch 1/2-inch down the material, and continue around the flannel.