Window safety (French Windows)

I have seen those slide thingies with stops that you crank down, but they're not necessarily out of reach for a toddler.  (I'm thinking more when yours is two or three.  Seems like there should be some that come with a lock, although you might have to carve out room in the bottom of the window sash for it to close and seal properly.  Possible low tech solution:  what about a door chain lock?   Mount it up high where only adults can reach.  Would not really be unsightly and would be relatively easy to remove and patch when kiddo gets old enough.  You could also just remove the handle after opening the window for a couple of inches.  I doubt that a toddler would be strong enough to force it open against the resistance of the hardware, but I think a chain or two might be the simplest.  Cheers, About The Same

We don't have french windows but do have floor-to-ceiling single pane windows (very common in east bay apartments built in the '60s) with a middle section that cantilevers out. We purchased guardian angel window guards that screw into the window frame--they are very sturdy and have a safety release (the child won't be able to undo it) in case you need to use the window in the event of a fire. They have a number of sizes, so you should check them out.  If you have to install the bars horizontally (like we did), you might want to think about placing a clear plastic Lexan sheet over it (which you can buy off Amazon in many sizes). Since our windows are so old, we were worried about them breaking if our son tossed a heavy toy.  We also didn't want our son to climb the bars like a ladder, so the lexan sheet prevents that also. If you contact me, I can share pictures. We zip-tied the lexan sheet to the window guard. (we can still access the window in an emergency, as we did not need to cover the window floor to ceiling, only about 25 inches from the floor). 

Child fence? Or a sheet of plastic?  Try TAP plastics.