How do they work? Good question! According to the instructions, you stick them on your belly so mom and dad can pipe in sophisticated, classical music. Because God forbid your baby doesn’t pop out whistling sophisticated, classy music. We recommend the purchaser of bellybuds have their baby listen to instructional CDs on how to deal with gullible, easily bamboozled parents. Well, at least they’re only… $49.99?! Good Lord.