[QUOTE=mkmama;6754987]Yes. As soon as they can sit up by themselves...they start pulling up. QUOTE]
I don't necessarily think that is true as my son can sit unassisted for a couple of months now but still doesn't pull up yet. So we still haven't lowered his crib. But we will when he can start pulling up.
My DS also sat unassisted for a couple months before I lowered the mattress... but during that time we mostly coslept, and I probably would have lowered it sooner but was too lazy
I lowered it a couple weeks ago, when DS started crawling one night and pulling himself up the next... you'll know when it's time, I had horrible visions of finding DS on the floor w/ a broken neck b/c he had climbed out of the crib... so I knew it was time.
I think w/ my next child I'll just start the crib at the lower level... the side rail goes down anyway, so what is the point of having the higher level, other than making it easier for parents to reach baby? I think w/ the side rail down it would still be just as easy to reach baby, and then you never have to worry about lowering it