Pretty much what everyone else had said: good for newborn stage, less bulky than Ergo, easy to put on. If you think the original could get too hot they do have a summer version which is supposedly to be cooler. I am just under 5'3 and 115 pounds and the XS is a good fit for me. If you find that it stretches out after a few wear you can just put it back the washer/dryer and it will go back to the original size.