Screwing and unscrewing bottle caps?!

Question

At what age do they normally do this? 
My LO usually pretends to drink from a soda bottle, but we always leave the cap on.
Cue to yesterday,  I gave her a small water bottle with the cap on, and I turned around for like 10 seconds and there she is, drinking water. 
Ok, I must have not screwed it properly, but then today I was drinking some yoghurt and she comes, takes the cap off the table and nonchalantly screws it back on my yoghurt bottle.
I tried to search online, but didn't really find any info and I am getting worried she'll figure out how to undo the baby locks which seem to me much easier to fiddle with than  a bottle cap.
Any advice is appreciated!
Thank you!

Answer

My son has figured out our cabinet locks and will unscrew the lids from his sippy cups. He would do bottles too but I have my husband tighten the caps (and I can’t even get them off lol). I think at this point the only thing you can do is have constant supervision on her!

Answer

Oh we’ve been doing lids and bottle tops a while. He is very mechanical. He’s even managed the push down medicine bottles at least twice 😫😨  and I know those are closed properly.

Answer

My only thought is maybe try to screw the caps on super tight? Otherwise i'm in the same boat with my lil man, he's been screwing and unscrewing bottle caps for a few months now, maybe 3-4 months, and he's started drinking from the bottles about 3 months ago. Oh and don't even get me started on the babyproof locks... he figued out how to unlock them maybe 1-2 weeks after we babyproofed the house 😂 now when he finds one accidentally left unlocked, he comes to get me, takes me to it and shows it to me and gives me this look like "you forgot to lock this, AGAIN" 😂

Screwing and unscrewing bottle caps?!

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