Stairs and Babies

SweetMamma Said,

My baby is only 3 weeks old right now so I do have a bit of time. But I am trying to get everything baby proofed so when she starts scooting and crawling I am prepared.

I need a gate for some stairs that go down to the basement. I have a gate that I am going to use to block off a hallway that leads to a bathroom and our bedroom but I don't think that type of gate is safe enough for stairs.

What kind of baby gate do I need or what special features make them good for stairways?