Rex Wild Wonders wooden rattle Her Dandy Wolf Wood Shaker Rattle BridgeSet Sound Wooden Rattle Rabbit 1 Piece (Pine Wood) at 120 piece Wooden Wooden Spinner Rattle Wooden Ratchet Noise Makers Keystone 4. Rattles work on the baby's fine motor skills by encouraging various types of grasping skills. They grasp and hold the baby's attention, improving their cognitive growth. Babies observe that as they move their hands, the rattle sounds, and start understanding the concept of cause and effect.