have you tried duct tape just kidding. i agree with monkey mama, you need to move them out of the play yard. Reminds me of a little guy I had many years ago. He was 17 months or so and had just started with me. I put him to be in my bedroom and came down to go about my lunch etc. I heard something and walked out into the hall only to see him walking down the stairs with a can of coke from my hubbys bedside table. the feeling of dread that went through me. he had spilled the pop all over the carpet but luckily didnt get into anything els. at pick up, mom says oh ya, he's been doing that for awhile. UGGH are you kidding me, would have been nice to know ahead of time.