You say that your baby is 10 months old, I recommend you that it is inappropriate to wear sunglasses. Because your baby's visual function is not yet mature, it needs for more bright light and clear images to stimulate. Wearing the sunglasses for a long time, macular area can not be effectively stimulated, which will affect the further development of the baby's vision, and even lead to amblyopia. If you still want to buy a pair of sunglasses for your baby, you can choose polarized lenses, and the color of lens can be gray or smoke color, do not choose the yellow or red lenses. You can also make your baby wear wide-brimmed hat to prevent direct sunlight to the eyes.