Mostly the new mobiles have a very secure attachment that hooks to the bars of the crib and won't work on the side of the pack n play. I have an old style mobile that I attached to the side of our cosleeper that is not as secure as i'd like... hence the reason for the design changes.
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Re: Can you put a crib mobile on a pack n play?
i don't think so but there are some PNP that comes with them.