We took both my boys at that age and unfortunately they tended to get sick............this is way TMI, but keep a big ziploc with you always. I think the excitement and the environment gets to the little ones quickly. My first time I was unprepared and it happened on a bus. The next time, I had my zippy and at least it kept everything contained. No, I don't have sickly children.............but both of them got sick on their first trip. It has never happened again, but I still keep my zippy.