I'll simply reaply to you title question :) Stuff, no matter how nice and natural it is, is always stuff. So yes, there is such thing as too much wooden toys. It is no different then with plastic toys. If they the children) have too many, they still are not able to function within it, and it can creates clutter. I strongly suggest reading simplicity parenting about this. Good luck!
11/28/10 at 12:39pm