One thing I have noticed is that it really depends on your group. Before i moved, my group loved the mega blocks and cars and trains, so they were always out. Now, this past weekend I finally put all three of those things away because my new group, although similar ages, don't actually seemt o play with those things and instead the babies just drag them around and make unnecessary messes or try to put the cars and trains in their mouths etc. I think I will put away the train table as well because now there are no trains for it unless someone asks...which nobody does! So, for me, rotation kind of goes by interest...if I notice something is not being played with, I put it away for awhile and maybe next time I take it out someone will play with it..if not, away it goes. Too much stuff just means more mess and doesn't mean more fun It also depends on how much space you have. In my old house, I couldn't have ride-ons or strollers because the space was too small and kids would get run over. I now have a huge space, so we can have these things out with minimal issues. What you buy has to make sense for your space.