Possible Clues:

• Sounds as if it's loose enough for a little one
• Try to find out what's in the box - it's a toy for a baby
• ...but it won't bother the baby!
• Unsettle
• Noisy tot toy
• For baby that sounds loose enough
• Toy for baby or football fan
• Disconcert - conductor, Simon
• That sounds loose enough, by the sound of it, for baby
• Unnerve, unsettle