my daughter was one of those at about 12 months that leaned forward with the seatbelt buckled and she got stuck forward, but didn't fall. The seat fabric is not tethered to the back frame so they can pull the whole fabric seat part out of the frame/forward. The vibration setting rattled which was highly annoying. I had to stuff a soft toy between the vibration unit and the bottom of the seat. Got almost no use out of it and then it just became a place to put toys.