Child Damage Mitigation

Too late for a vasectomy. Have you researched child surrender laws in your area? You might still have time.
i imagine it will be longer than 6 months before you even consider leaving a mobile child unattended. Play pens and child gates should work fine until they're old enough to understand that some places are OB. The kitchen is probably a more dangerous environment. As in climb the cupboards for cookies (or vitamins), get hands on the butcher knife to hack a piece of cheese, or put toy dishes on the real stove.
if you’re set on keeping the Maggies (and the kid) you might look into aftermarket stands that are more stable and possibly weighted.

Lots of fun responses, but children actually learn the word “no”. It’s pretty simple really. Applied with proper tone and with diligence, it’s amazing what kids can learn... I’ve got three grand children, 7, 4, and 1... the “N” word works every time. Little ones are like puppies. They need constant visual attention. Just the way it is. 

Raised 2 now 2 grand kids no problems with floor standers, never been touched.
Was more worried about montors on stands.
Kids take direction remarkably well.

geof3,

...but children actually learn the word “no”.

Did you win the lottery, too?

I am trying to pick the word for this moment. Envious or jealous?

Invert your thinking. Literally. Consider ceiling mounting your maggies. Same location as now, just hang them from the ceiling. I my last house, the perfect location for the speakers would have also destroyed a beautiful view and much of the utility of the room. Solution was to hang them from the ceiling. Admittedly the soundstage was elevated, but otherwise they sounded fabulous. Just be sure to hit for ceiling joists with your mounts, and run the speaker wires through the ceiling, and down the inside of the walls to your amp.