Hello, my dd is 6 months 1 week old. She is sitting, although still wobbly but is not rolling-is this ok? I have seen her roll onto her side some time ago, but she seems to be focused on sitting and is always trying to sit up when she is laying down. Should she be rolling before sitting? She likes to be up and likes to stand, obviously supported by us. She sleeps in a sleepyhead so I wonder if this prevents her from rolling too?