Even if your baby is old enough to stand and can reach the monitor arc, it’s unlikely they could turn gesture controls on because they’d lack the strength to push down on the monitor arc 3- 4 consecutive times.
If you toggle on “Stop Bounce,” your baby might be able to turn it off by tapping on the monitor arc or rails. The crib will stop bouncing gradually rather than suddenly stop, and won’t pose any danger to your little one.