Door Knob Locks -- Any Recommendations?

[anonomom]

I can't believe I've been a mom for over seven years and I am just now asking about a babyproofing basic, but there it is. DS has recently learned how to open doors, and I really need him not to be able to do that. Has anyone tried those round doorknob-cover thingies? Do they work well? Can older kids (4 and 7) work them? I need to do something to keep DS contained, but i don't want to waste money on something that makes it harder for everyone except him, kwim?

[rin]

We did not find any of them to be effective; either they broke or DD could open them. We ended up installing a hook-and-eye latch at a height that DD can't reach. FWIW, she can actually do/undo the latch if she's able to reach it, so I imagine an older child should have no problem.

[swrc00]

This is the only one DS could not open. http://www.buybuybaby.com/product.asp?SKU=14844732&

[waitingforgrace]

We like these
http://www.buybuybaby.com/product.asp?SKU=112240&RN=0

And we love these on some doors because they still allow airflow throughout the house
http://www.amazon.com/Door-Monkey-Childproof-Pinch-Guard/dp/B004ECJWK4/ref=sr_1_1?ie=UTF8&qid=1360613338&sr=8-1&keywords=Door+monkey