Shake it, baby! This sweet, colorful monkey rewards your little one's batting and shaking with fun rattle sounds. His soft, tactile arms and tail add to the sensory stimulation. There's even a link so you can take this rattle along when you and baby are on the go-go-go! Where development comes into play Sensory - Rattle sounds, bright colors and soft textures help boost your newborn's senses of sight, hearing and touch. Fine Motor - Grasping and shaking the rattle help foster eye-hand coordination and fine motor skills.