Shake it, baby! Your little one will be rewarded with bright, colorful beads inside each bongo drum and fun rattle sounds, too. The handle is designed to fit perfectly in even the tiniest drummers’ hands, so it’s easy to shake, rattle and make some noise! Where development comes into play Sensory – Rattle sounds help stimulate baby’s sense of hearing. Fine Motor – Shaking the rattle helps foster eye-hand coordination and fine motor skills.