Cole- growing up fast

Cole started pulling up a couple of weeks ago. I put him in his crib for a minute while I did something else and turned around to see him standing up. We had to lower the bed after that incident. We don't want him falling on his head. Now he pulls up on EVERYTHING! One of his favorite things to do is climb into Anna's princess chair. That really ticks her off because she's just not into sharing at all. He also thinks it's funny to play in the fireplace. If I turn my back on him for a second the next thing I know he's in the fireplace.