Frankly speaking, this is an issue that whether babies should wear sunglasses. On one hand that exposure to ultraviolet rays may raise his risk for cataracts and other eye problems later in life. On the other hand babies are not developed yet. The sunglasses may have negative effects on their eyes, especially the low-quality sunglasses. If you really want to buy her a pair of sunglasses, you should take her to the professional institution to have a check and fill her suitable one. Personally, I suggest that you'd better not take her out when the sunshine is strong. If it is inevitable, you can buy her a hat and have something shut out the light.
Sunglasses for children should provide virtually 100% UVA protection and conform to European safety standards, EN 1836:2005. The most important is they should feel comfortable on babies face otherwise they would throw them away. It is better to go for wrap-around style sunglasses which provides excellent coverage and protection. i think Baby Banz is a good brand for baby sunglasses.
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.
Whether it's summer or winter, baby sunglasses are a must-have, for the purpose of buying the best baby sunglasses, you can fellow these tips: Look for sunglasses with coverage around the eyes to protect the eyes from all angles. Choose sunglasses made of flexible and non-breakable materials.The best baby sunglasses are labeled with 100% protection against uvA, uvB and C rays.Look for sunglasses that fit well. if the sunglasses feel uncomfortable to your baby, he will not want to wear them. Check the lenses for scratches. With scratched lenses your baby's eyes have to work harder and this may cause squinting and headaches. Pay attention to certain things above and you can shop for a pair of baby sunglasses for for both boys and girls.