Ring Rattle K'NITS are perfectly safe for kids of all ages, but are designed for infants ages 0-12 months. At this age, children need sound and rhythm to begin their development of speech and understanding of their world. Ring Rattle K'NITS have a rattle sound which is a sound that has been found to be particularly stimulating to these young minds and their bright colors will draw the child's attention, engaging them in learning and fun! K'NITS are machine-washable and dryer safe. We recommend washing K'NITS in cold water with the machine on a gentle cycle; it is essential that they are dried under low heat. Use a mild detergent and do not use bleach.