I can not get these bowl to stay suction onto we highchair tray for longer than 1 minute . I have try make sure the tray be perfectly clean & smooth , wet the bottom suction cup , etc. , but nothing will keep it on . my son do not even try to lift the bowl and it pop up and move around while he be try to eat . once even pop up before anyone have touch it at all ! if you want bowl that actually stay suction on , I would suggest the similar `` sassy '' bowl set that also have lid . they design have a removable suction cup that fit all three bowl . I think it work better because the suction cup be all one piece of flexible rubber and be not join to the hard plastic bowl like the Munchkin set be .