We are going to WDW in September with our DS's 4 and 1 at the time of travel. DS1 doesn't like to stay in the stroller much and is now too big for the baby bjorn so I was thinking about getting another carrier to use for this trip as well as for all of our DL trips. What are the pro's and con's and what carrier do you like the best? I've heard of Ergo and Beco's but don't know much about either of them. I want him to be comfortable but I don't want something that is going to make the both of us HOT! Thanks all!