What a horrible design! First of all my daughter hates the strap behind her head which she is constantly banging against and then the strap that goes in the bouncing mechanism is all twisted and won't stay straight. As a result it is fraying and will break if I let her bounce in it much longer. Luckily my daughter never smashed her hands against the door frame but as other reviewers noted this is entirely possible and likely given the design. I was hoping to buy a fun jumper to last through all my children but this is definately not the one to buy...save your money. Mine is going back to the manufacturer.