Parents should be very careful when choosing sunglasses for their children, especially kids before the age of 6 years old. First, you'd better choose children's sunglasses lens made up from resin, PC. Second, make sure the sunglasses can provide 100% UV protection so that they can protect the babies' eyes from being damaged. As for the color, dark grey is the best choice and try to avoid choosing yellow or red lens. Last, the quality of the sunglasses is of great importance. I'd like to suggest you to go to shop-in-shops, for their products can provide quality assurance.