Newborn baby has sensitive cognition of music and rhythm. They will kick or turn head along with the music. Experts recommends providing baby this kind of dynamic toys with vision, hearing, and tactility, to develop baby's fine motor skills, hand - eye coordination and motor ability. Wonderkart all new imported huile baby rattle stick with sound and lights. Comes in 12 different designs. Amazing sounds which attracts the baby and keeps them busy. This has colorful beads, when shaking the stick, the colorful beads will jump and make silvery sounds to accompany with music. Note* battery type: 2 x1. 5V "aaa" batteries (not included). Product size - w (6) cm x h (16. 5) Cm.