I used a ring sling and found it very comfy. In fact I was still using it beyond 12 months. It did take a bit of practice to feel like baby wasn't going to fall out, but I think the trick is to make sure baby's bottom is on the seam. Once I worked that out I found it a breeze to use. Just make sure the cloth is spread across your shoulder properly, not bunched, so that the weight is more distributed. Then as bub gets bigger you use if for a hip carry also, and even on your back.