Toddlers also open levers easier. When Minifob was 2-ish, we had to replace the lever knob on our front door because the child-proofing things for levers are weak (given the fulcrum physics of levers) and he kept being strong enough to break it and get out.
The only other way to keep him in (which my friend does, and we did consider) would have been installing an interior key lock and requiring a key to leave the house every time. Of course that's against building fire safety codes, too, so if I'm already a criminal I might as well get online and buy some contraband round knobs. Just tell the company to put it in an unmarked package.
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