Locking Safety Bed Rail Brackets - Rockler Woodworking Tools - The interlocking safety latch prevents bed rails from becoming disengaged, while the thick steel construction adds strength.
DIY Thinking maybe just going straight to a full when we make the transition.
Toddler Rails 3
How to make a Toddler Bed Guard by trevormates or just a homemade baby gate
Child Craft Logan Full Size Bed Rails for Logan Lifetime Crib, Jamocha