My DD, coming up for 2, can't jump off the lowest stair onto the ground without holding onto my hands. She was a late walker, 18 months, and cautious. She runs around a lot and scoots and will bounce on bed and bounce to land on her bum happily, but can only jump (slightly) on the bed but not really with both legs up. We think she is hypermobile but am I expecting too much?!