Pooh-sized? What you meant to say was Shrek-sized.
Anywho, the rides that are of Concern all have Test Seats outside of them: Hulk, ROTM, Dueling Dragons, and Doctor Doom.
For Doom, Hulk, and Dragons, you must be able to bring the harness down AND buckle the belt. For Hulk and Dragins, there is a larger seat available (and a larger test seat is out front) in rows three and six.
For the ROTM test seat, you must be able to bring the lap restraint down until you cover the red tape. You must keep your knees together, though.