Just because you CAN ride it doesn't mean you SHOULD ride it. Someone mentioned TSMM being jerky, well Pooh is also pretty jerky. Some attractions are also loud (I'm looking at you Tiki birds!)
With someone that small I'd stick to slow moving rides on the ground. So no Dumbo or Magic Carpets. I would stick with:
Adventureland: Jungle Cruise (skip pirates due to wetness, tiki birds are loud, carpets are too high, the treehouse sucks)
Frontierland: country bears
Liberty Square: Haunted Mansion
Fantasyland: It's a small world, Little Mermaid, carousel (skip Peter Pan and Dumbo due to heights, skip Pooh/Teacups due to jerkiness, skip Philharmagic/Belle/Barnstormer/Dwarfs due to not being appropriate)
Tomorrowland: Autopia, People Mover, Laugh Floor (skip astro orbiter due to heights, toy story due to appropriateness, stitch because it sucks)
With a 6 month old I'd be way more conservative than I would with a 1 year old. Only you can make the right decision for your kid, but the rides I listed will give you zero stress.