Where toddlers are concerned, I would advise getting some outriggers to stabilize the speaker better. I would also add, that the surface the speaker is sitting on also makes a difference. Personally I feel that a hardwood floor and rubber mounts are more stable than spikes on carpet, but either way it would be a good idea to use some outriggers if you've got curious carpet crawlers.

Half of communication is listening. You can't listen with your mouth.