...isn't?
My DD(2.5) has outwitted, with an olympic-standard gymnastic display:
-her cot
-the stair gate that keeps kept her safely in her bedroom (because DH found her flushing a roll of toilet paper down the toilet at 12.30 one night)
-her car seat strap
-the extra safe "houdini stop" designed to stop her wriggling out of her car seat.
WIBU to email all the manufacturers and ask for my money back as they're not fit for the purpose. Alternatively, I am considering hiring her out as an R&D tester for the aforementioned safety gear.