The baby bjorn has a new light material version that looks like it would be a lot cooler than the traditional ones. I had the "chiropractic" baby bjorn and really loved it, used it non stop. My DH loved it too and loved having our son in it! Looking forward to carrying my new baby in it soon. I also have the "natures sway" over the shoulder type sling and love it. I mostly used it when my boy was sitting up and almost walking but could not. It was fantastic. Prob not that great for the back but it never hurt. A lot of my friends used the same when the bubs were newborn and unsettled, could lie them in it and still get on with stuff.