I usually use this edging for flannelette or polar fleece blankets, but it could be used on crocheted projects as well!

If you choose to purchase premade baby blankets for this project, simply cut the hem off with pinking shears to ensure the fabric doesn’t fray.

In order to put holes in the fabric for the initial single crochet, I used a taylor’s awl and pushed the crochet hook through the fabric, but you can also get skip-stitch blades for a rotary cutter that will cut holes in the fabric. I’m not sure how this would go for woven fabrics because they may fray, but it would be fine for stretch fabrics such as polar fleece.
You could however, consider fray-stopper for woven fabrics if you choose to go for this option.