What makes a good ring sling?
When looking for a ring sling, I suggest that you get something that you fans out over your shoulder bone, not on your neck or between your neck and shoulder. If you get a sling that you wear on your shoulder bone, you get more support. If you get one that sits near your neck, it will end up stressing out the muscles and you'll get a headache.

So, IMO the baba sling and others like it are not ideal. I had a hatchling that was great, then made my own ring slings as per the instructions on the sleeping baby website (google it, then look for the DIY section).