High Contrast Visual Stimulation Box (0-6 months)Maracas : Playing musical instruments, such as the maracas, helps babies and toddlers strengthen fine motor skills, hand eye coordination, concentration, memory and audio development Dumbble Rattles : Helps baby in developing their senses of sight, sound & texture which is vital to their ability to make sense of the world around them. During the first three months of your baby's life, you can shake a rattle to help her experience and perceive sound.