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6-24 months is an age range which most baby gates are certified for by independent testing organizations.

The common belief by testing organizations is that beyond 2 years children start to become strong enough and smart enough to open most baby gates.

A small child wouldn’t figure out the lock on the Retract-A-Gate baby gate unless they were shown how, since you have to push down and turn at the same time (kind of like child-proof caps).

Retract-A-Gate is designed to be very easy for adults to operate, but would be difficult for small children to open the baby gate.