star jump in it? my LO sits in it and pushes herself up and back like she is star jumping/backflipping - am surprised she hasn't flipped herself out of it yet (which is why I sit right by her when she is in it!) ... does anyone elses baby do this? is it because she is too light for it? does anyone know if there is a min weight (got mine of ebay so no box - my LO is 17 weeks and weights 12 1/2 pounds... weighed her this morning!). I love the idea of a bumbo but am now a bit loathed to put LO in it even with me sitting by.