my dd has 3 in her room, her first one we hung from the ceiling above her change table, this was her first best place to be, we took the arm off that would have connected it to the cot, we used a cup hook in the roof and then used fishing line wire to hang it, the 2nd one we hung to the side of her crib, we hung it the same way from the roof, the third one we hung so she could also see it in her crib, we also have all her teddies hanging on a plastic chain from the ceiling, i must say i hadn't read the BW when we hung them and was a little bit concerned after reading it, but we never took them down, she still loves them, we have names for them and we say good night every night and nap time, sound awful but looks wonderful, she does have a very big room, luck girl, we gave her our room, if you decide to use your mobile then i hope your ds has as much fun using it as our dd has using hers