I never had a toilet lock, but I did put a gate in the door of the bathroom for a while. I couldn't close the door behind me or he'd scream if he couldn't see me (and the medicine chest is behind the door where I couldn't keep him out of it). Then we progressed to just keeping a gate up to keep him out of the back end of the house entirely (kitchen, bathroom, master bedroom). Somewhere around 20 mos or so it stopped being a concern for the kitchen/bathroom, and since about 25 mos I've stopped gating off the master bedroom (and the litter box). He's tall enough now that he can flip all the light switches and reach just about anything in a drawer or on the counter and all but the top shelf of the medicine chest. And we've (for the most part) taught him not to. In part by putting the stuff he's interested either down on his level, or up out of sight/reach. I put the fruit bowl down on a bench so he can help himself, and I keep the knives (and scissors) where he can't see them. When I'm cooking I either put the gate up if I'm not standing in the kitchen, or just keep an eye on him (since our kitchen is tiny I'm never out of reach of the stove). For the bathroom, he's curious about the toilet, but has never shown an inclination to flush things or do anything but look. He's far more interested in the sink, and I do have to keep an ear out for him turning the water on, so he doesn't scald himself (it takes several minutes to get hot, so I have time to go turn it off). For the medicine chest, I moved anything dangerous to the back of the top shelf, and if he wants to scatter bandaids around the house, or play with the ice bag, I don't much care. There was a period of time where I removed all the knobs from the stove because he was constantly turning them, and since we have gas I was afraid of him blowing us up, but that fascination didn't last long, and they're all back on now.Â
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His fascination now is pot handles, and since I cook a lot with cast iron, I have to be aware of that and either stand there or be sure to turn the handles inward so he can't grab them. Oh, and the freezer drawer - he's learned if he puts his weight behind it he can open the freezer, so I have to be aware of that also, so he doesn't leave it standing open. Luckily it's audible when it opens.Â
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My kid has certain obsessions, and the toilet hasn't really been one of them. The bathroom door (he likes to push the latch in and watch it pop out again), the sink (running water), the light-switch on the oven, the freezer. Luckily nothing that I'm terribly concerned about him hurting himself with. But every child is different, and you have to work both to your child's interests/adventure level and your own comfort.Â