My DS (turning 4 in a month) went on Goofy's Barnstormer several times with my husband, twice with me. Our 15 mo. old stayed with the parent NOT on the roller coaster at the time. Personally, I thought it was far too intense for a baby and never even CONSIDERED taking him on it -- but, I also didn't see any age/height restrictions, (I may have missed them???), so I suppose it's up to the parent's discretion. IMHO, I didn't think it was appropriate for my 15 mo. old. We stuck with the slower, less intense rides, and actually "tested" several rides by having one of us take our 4 year old to check it out first, before taking the 15 mo. old on it.