Best stands so baby doesn't knock speaker over

Looking for the sturdy bottom weighted stands so my baby doesn't knock off my Klipsch RP600s or whatever other bookshelves I'm playing with at the time.  I'm not really looking for audiophile anything as these are for a bedroom. 

It's hard to tell "sturdy-ness" online.  I would love a granite or marble base for weight but not sure that's affordable.

Any one have any experience with this?