We were there with my daughter in May and June and she was almost 3 months and almost 4 months during the trips and we used the Disney buses. About 90% of the time she was in a Baby Bjorn, mostly cause I needed my hands free to carry a bag, water, etc., while my husband carted the stroller around. I did feel a little better about her being in the Bjorn, so that if we did stop short or something like that at least I wouldn't have to worry about holding onto her, but there were times when she fell asleep in my arms and I just carried her that way onto the bus. People were great about getting up to give me a seat if the bus was full, which was very nice cause I did feel much safer in a seat than on the few occasions I had to stand.