Our DS has been at 5 mos. and 9 mos., and will be going again in October at 15 months. We have brought him on everything without height restrictions, including Pirates, the Haunted Mansion and Jungle Cruise. He did fine on everything. He especially loved Small World. I used a snugli carrier on two previous trips and that worked great, especially for waiting in lines. We're hoping he'll be walking well for our next trip, because he doesn't fit in the carrier anymore. We never brought him on Dumbo, but I don't see why not. Some of the shows are super loud, so you'll have to judge your baby after it's born and decide then. Have fun!