Stairs Woes

Josey and Roanen both love the stairs at the new house. Originally we had planned on putting gates at the tops and bottoms so there wouldn't be any accidents, but they have so much fun being able to go up to their bedrooms and play independently that we just didn't bother. Unfortunately, Roanen is getting extremely brave and wants to go up and down the stairs like a big boy standing up and holding on the the railing with one hand. Then, two days ago Josey got excited and pushed him with his feet off the third step and he ended up with a few nasty bruises. I should have blocked the way then, but didn't. This morning Roanen ended up falling from (according to Josey) the last step while he was heading upstairs. I was going up the back stairs to meet them and I just heard bumping all the way down, then crying. Again he recovered quickly with a couple of bumps on his head, but I'm going to have to put the gates up now, so fun's over boys :(