Since Ezra doesn't have a crib of his own he hangs out in the pack n play from time to time. I decided to attach the mobile the other week and Ezra was thrilled. It has three bears hanging from it and he thinks they are his new best friends. He squeals at them, giggles, and makes silly raspberries. It's really funny to watch how into them he is! I guess mobiles really do serve there purpose! Who knew?