Pulling to Stand

Last night, I was getting Noah ready for his bath. I stripped him down to his diaper and put him in his crib so that I could go and run the bath. When I came back in, he was standing in the crib grinning at me. That's the first time I've seen him actually pull himself up into a standing position. We had just lowered his crib a couple weeks ago to the middle level. Now I'm not sure if we should put it all the way down. It did make me decide that it really was time for us to take his mobile off... that made me sad. Noah LOVED that mobile, but I guess it's a hazard now, since he could try to pull himself up by holding onto the mobile, and bring it crashing down on top of him.